sodium reaction with water

Sodium bicarbonate (IUPAC name: sodium hydrogen carbonate), commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO3. The environmental conditions are: Q. "palette": { I'm just curious what the byproduct(s) might be, and also what the basic mixing ratio is (which I'll need to scale up or down based on the water quantity being treated). But when added as powder 40% of reaction produces an Impurity. - Control the Ph level and the solution temperature would prevent detachment of SO2? ©1995-2021 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy The resulting solution is usually colorless and odorless. In my application I'm interested in dissolving SMBS for production of sodium bisulfite for water treatment. I'm currently working on a mining project for a gold mine that involves the usage of Sodium Metabisulfite. Q. I'm looking at the possibility of treating surface water (from a river) with either Sodium bisulfite (SBS) or Sodium Metabisulfite (SMBS) for the purpose of removing dissolved oxygen. I normally would think that your chemical supplier should have a lot of your question answered. This website uses cookies to improve your experience while you navigate through the website. Isn't it true that the SO2 we smell is the SO2 we wasted, so we should keep the pH as high as possible as long as it still works? What I understood so far the main issue would be release of SO2, but controlling pH and temperature would help out to control the release, although I was wondering how to keep a Food Grade when blending the water with SMBS. This reaction is a weak acid - strong base reaction and also important in explaining acidic behavior of organic compounds. Consult'g, Train'g, Software Environmental Compliance. In the reduction of Cr6 the pH has to be lowered to approx. Sodium Metabisulfite contains 65% of SO2 available. Phenol (C 6 H 5 OH) has an enough acidity to react with aqueous sodium hydroxide (NaOH). Altitude: 4000 m.a.l.s As soon as the lump of metal hits the water, it is instantly enveloped in a cloud of hydrogen gas and steam that should cut the sodium off from the water and stop the reaction – but it doesn’t. It will be very helpful for me if someone can clear my doubts up. Thanks Geoffrey. Find the perfect sodium water reaction stock photo. What are the correct statements of followings. Sodium, chemical element of the alkali metal group in the periodic table. I don't know why you are using SMBS but it won't perform a reduction process unless the pH is low enough to release the SO2 gas. I created this video with the YouTube Video Editor (http://www.youtube.com/editor) A. Sodium hypochlorite can also be used for point-of-use disinfection of drinking water, taking 0.2-2 mg of sodium hypochlorite per liter of water. window.cookieconsent.initialise({ Na2S2O5 + 2HCl => 2NaCl + H2O + 2SO2. I was wondering if anyone can guide me on SMBS make-up from powder to SMB liquid 38%. The reaction of sodium metal with water/alcohols is: 1) 2 N a (s) + 2 R O H (l) ⟶ 2 N a O R ↓ + H X 2 ↑ where R=H for water, and is the hydrocarbon chain for alcohols. We get it in 1200 kg FIBC bags with an inner liner and still have problems with gas production in hot humid days via hygroscopy. Phenol reacts with aqueous NaOH to produce sodium phenoxide and water Can this affect the reactivity of the powder? NaHSO3 = Sodium Bisulfite. A. Sodium behaves as a reducing agent in this reaction. NOTE: This is the basic scheme of the process: Reiterating my personal experience with the use of SMBS for reducing hexavalent chromium to trivalent, I found that a long retention time allowed reduction with a reasonably high pH (about 4 - 5 if I recall correctly), and very little evolution of SO2 gas into the air; whereas a lower pH allowed a much quicker reaction but with far more release of SO2. The formula, shown in Wikipedia and elsewhere, is: Thanks! - I also read that at low temperatures (just like this case), sodium metabisulfite forms hydrates with 6 and 7 moles of water. I would have thought that as you indicated if you made the solution up and raised the pH high enough with caustic I believe there would be no smell, probably pH 5-6. }); I know SMBS + water produces SBS, and is typically less expensive. "text": "#237afc" Properties and production Because sodium is extremely reactive, it never occurs in the free state in Earth’s crust. A. Hi Bruno. Genom att klicka på "Acceptera" godkänner du att ALLA cookies används. Q. Hi everyone, Reaction of sodium with water Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H 2). - In order to avoid oxidation I read that inject dry air or N2 to the powder before mixing with water would help, but how can I know the amount of Dry air/N2 has to be injected? This category only includes cookies that ensures basic functionalities and security features of the website. I don't know the reaction in the gold recovery but would expect the pH would need to be much lower so a source of acid would be needed and tests done to determine the max pH that the reduction will take place. The release of SO2 is unwanted, and I would like to know if the release of SO2 can be avoided if dissolving in a neutral or high pH environment. 2Na + 2H2O --> 2NaOH + H2 Huge collection, amazing choice, 100+ million high quality, affordable RF and RM images. The resulting solution is basic because of the dissolved hydroxide. sodium borohydride if the predecessor steps are improved. Similar to the hydration of sulfuric acid, dissolution of solid sodium hydroxide in water is a highly exothermic reaction where a large amount of heat is liberated, posing a threat to safety through the possibility of splashing. Impressive flow sheet, if your interest is using the SO2 to precipitate gold from aqua regia, Why not use SO2 gas? [32] Dilute solutions (50 ppm to 1.5%) are found in disinfecting sprays and wipes used on hard surfaces. Having said that, in solution where the pH exceeds 8.5, the bisulfite forms sulfite, which has a maximum solubility of roughly 10%, meaning everything over that will precipitate and end up as white crystals in the bottom of the container. Good luck. Necessary cookies are absolutely essential for the website to function properly. Please spend a couple of paragraphs so we understand what your question is. It is mandatory to procure user consent prior to running these cookies on your website. It has got vigorous reaction with water forming sodium hydroxide and hydrogen gas. Final reaction product - complete hydrolysis with no water left The amount of added water can be as little as 2:1 by weight (water to NaBH 4 ), giving in practice the weight percentage of generated H 2 in excess of 6 wt.% (calculated in relation to both water and NaBH 4 ). it will save you a lot of steps and at the end you have much less spent solution to treat. If you need a product/service, please check these Directories: Jobshops Capital Equip. Vi använder cookies på vår webbplats som kommer ihåg dina preferenser för att ge dig en så relevant upplevelse som möjligt. These cookies do not store any personal information. I am not familiar with using SMBS at anywhere near that concentration; why does it need to be so concentrated in a water treatment situation? But opting out of some of these cookies may affect your browsing experience. I have more questions but these ones are the most important. But I don't understand what kind of help you are looking for :-(. It's hard to use this product and not produce SO2. Sodium Metabisulfite and its reaction with water A discussion started in 2014 but continuing through 2019 August 24, 2014 Q. Hi everyone, I'm currently working on a mining project for a gold mine that involves the usage of Sodium new LazyLoad(); "background": "#fff", "popup": { I'd like to know how did this go and what are your conclusions? Via: e-postVia: telefon Sodium Metabisulfite will be mixed with water to create a first solution at 30% in a make up tank (preparation tank + mixer/stirrer) and after that will be deposited in a storage tank of 12 hours autonomy (it's a batch system), this solution will be dosing to the process not before pass through a post-dilution system (static mixer + water) that will make final solution has 10% of concentration. But Wikipedia offers data indicating that it is very highly soluble, so mixing it at that concentration sounds possible. "background": "#237afc" - By adding chlorine gas (Cl 2) to caustic soda (NaOH). Thanks, During the reduction H+ is consumed so acid needs to be continually added and if the pH rises to about 4 the reaction is no longer instantaneous (so continuous acid addition is required.) Any information is welcome. The mix and holding tank have to be sealed and vented or you will gas out the tank room. new LazyLoad({ This reaction occurs so fast and form a … While it is not instantaneous and may take a minute or two at pH 4.5 instead of 2.5, my experience is that it will reduce the chromium without a lot of fuming and wastage to fumes. We also use third-party cookies that help us analyze and understand how you use this website. It might work! The water they will use is demineralized. On a side note: the river water will be pre-filtered for larger materials (algae, etc. A discussion started in As products, sodium phenoxide (salt) and water are given. No need to register, buy now! The concentration required is 40% w/w of SBS. The best condition of VCO hydrolysis using 1% of … The reaction is exothermic. What to Expect. 3 for instant reduction to Cr3. Sodium moves in water as the dihydrogen gas formed below the waterline pushes sodium. The reaction is: 2 Na + 2 H 2 O → 2 Na + + 2 OH - + H 2 (g) Sodium Bisulfite solution at 30% Thanks in advance for any and all insight/input. Please tell us why you are using SMBS so we can understand your needs better. Sodium: Sodium also floats in water, but enough heat is given off to melt the sodium (sodium has a lower melting point than lithium) and it melts almost at once to form a small silvery ball that moves rapidly across the surface. My doubts are relating of how to handle properly this chemical powder and its solution. Q. Hola Alejandro and Everyone, A. - How much amount of this gas is released? I am in the water treatment chemical industry and use sulfite containing solutions. My own practical experience, without a lot of chemistry knowledge, is that SMBS works to reduce chromium from hexavalent to trivalent up to a pH of nearly 5.0. Sodium borohydride and sodium methoxide are insoluble in mineral oil and are easily separated from the & Install'n Chemicals & Consumables The reaction is 2 NaHO2 (solution) → (time) 2 NaOH + O2↑ (normal temp.). According to my notes, SMBS has a maximum solubility of approximately 38%. Very well explained question. - The oxidation process when SMBS get in contact with air, how fast is it? Reacts with water, acids, mono and dioxide of carbon. Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder. This will be contained in a closed tank Jag föredrar att bli kontaktad In water and wastewater treatment, it is this SO2 that provides the reducing power. Sodium is a metal but being very light, floats on water. And you can expect rampant scaling of all slurry handling equipment downstream. Q. I am using SMBS as antioxidant for Manufacturing of API. })}); Not a lecture hall but a roundtable with a seat for you! Sorry but I don't know what you mean by API, or whether there is a need to use 40% concentration SMBS when making it, or what impurity you are referring to :-), It sounds like you are implying that that this high concentration of SMBS causes some kind of reaction that produces an impurity that is not produced when SMBS is used at a lower concentration? Sodium amide reacts violently with water to produce ammonia and sodium hydroxide . - This can also release SO2? $$\ce{2 Na + 2 H2O-> 2 Na+_{(aq)} + 2 OH-_{(aq)} + H2}$$ Sodium oxide can be synthesized by reaction of sodium hydroxide with sodium: Temperature range: 1 °C - 15 °C window.addEventListener("load", function(){ 2Na+2H2O=2NaOH+H2. If sodium reacts with an excess of water at standard conditions, dissolved sodium hydroxide and hydrogen are formed. A very violent reaction of sodium and then potassium with water. This reaction is highly exothermic evolving a lot of heat which is sufficient enough to melt sodium due to its low melting point. The reaction of Sodium MBS and water is rule by the following: - Sodium MBS + demineralized water release SO2? The reaction product is a fully transformed solid sodium borohydroxide, as shown below. The reaction generates heat slowly, and lithium's melting point is too high for it to melt (this is not the case for sodium). So my questions are: - If there a way to eliminate the O2 inside of the tank? Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Research this product thoroughly before implementation. Does anyone know if the SMBS or SBS would be a better option? As soon as dropped in water, metallic sodium actually floats, runs and dances on surface of water making hissing sound; it catches fire also. A. I've used SMBS for 5 years now (Zn depression in Cu circuit). "button": { A. Hi Ted In 1807 Sir Humphry Davy became the first to prepare sodium in its elemental form, applying electrolysis to fused sodium hydroxide (NaOH). Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and evolve hydrogen gas (H2). Chlorine , bromine and iodine react with sodium hydroxide to form a mixture of salts and water The reactions become less vigorous down the group as the reactivity of the halogens decreases elements_selector: "iframe" A. Hi Sakina, I'm not normally on this website but stumbled across you question and may be able to help. Thanks for useful chemical comments on the above topic. - If Sodium Bisulfite solution get in contact with O2 becomes oxidize (to sodium sulfate), but how fast is this oxidation? Step 7 is the quenching of Step 6 reaction products with water. It is a salt composed of a sodium cation (Na+) and a bicarbonate anion (HCO3−). Na2S2O5 + H2O --> 2NaHSO3 A small piece of sodium metal will be placed in a bowl of water. In the plating industry we tend to use smaller amounts (often purchased in 50 pound bags rather than 1200 kg) and higher dilution ratios. These cookies will be stored in your browser only with your consent. - Due to I don't know how much gas will be given off, do you consider a scrubber is required? Look at this figure for reference: You also have the option to opt-out of these cookies. The water consentration and reaction temperature influenced the FFA content, reaction conversion, and the reaction rate constant. ), but won't undergo any other chemical treatment besides what I've already discussed for the D.O. (H 2). But the main release of SO2 comes during the acidification. Chemical lecture experiments . However after reading about this chemical it looks like a certain amount of SO2 is released. } Probably the majority of people in the chrome plating industry (and those platers still using hexavalent chromates) use SMBS to reduce hexavalent chromium to trivalent. - How can I control the releasing of SO2? Tel Sodium A white trail of sodium hydroxide is seen in the water under the sodium, but this soon dissolves to give a colourless solution of sodium hydroxide. Namn Hydrogeologist - Land O Lakes, Florida - US, ©1995-2021 finishing.com, Inc., Pine Beach, NJ, How Google uses data when you visit this site. Sodium dithionite is a combustible solid which slowly decomposes when in contact with water or water vapor, forming thiosulfates and bisulfites. }, E-post This is for a water re-use project, where the D.O. Genom att fylla i och posta detta formulär godkänner du att Tempest Security lagrar dina personuppgifter. Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and evolve hydrogen gas (H2). Please advise how we can avoid this formation of Impurity. content is of particular concern. OnDuty – Säkerhetssupport med fysisk resurs, Sjukvård – Första hjälpen och akutsjukvård. This reaction evolves heat, which can further accelerate the reaction or cause Meddelande When Sodium MBS get in contact with air becomes oxidize (loss part of its SO2 available) A. Hi Sakina. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. (adsbygoogle = window.adsbygoogle || []).push({}); Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. Chemistry teachers and instructors are usually reluctant to perform experiments that include a hazard. Iodine dissolves slowly to form a mixture of sodium iodide , sodium iodate (I) and water Due to their acidic property halogens are more soluble in sodium hydroxide than in water. I realize that this is not quite responsive to the question about using it for gold refining, but I mention it on this metal finishing site because every approach has advantages & disadvantages and I would not want readers to think it is excessively dangerous or non-useful for reduction of hexavalent chromium. Elementary sodium reacts strongly with water, according to the following reaction mechanism: 2Na(s) + 2H 2 O → 2NaOH(aq) + H 2 (g) A colourless solution is formed, consisting of strongly alkalic sodium hydroxide (caustic soda) and hydrogen gas. } Not sure if I should comment because this is all from memory after over 20+ years of retirement. - Is there another way to extract this gas from the tank? Lyazzat. - How hygroscopic is this powder? If sodium is Hope this helps. If a phenolphthalein indicator has been added to the water, the sodium will leave a pink trail behind it as the metal sputters and reacts. The amount of SO2 released depends on temperature, ph, and the % concentration. The resulting solution is basic because of the dissolved hydroxide. Due to its hygroscopic properties this powder absorb the moisture contains in the air quickly. Humidity is around 70-90% The reaction generates heat too slowly and lithium's melting point is too high for it to melt (see sodium below). During this reaction the explosive hydrogen gas is also formed. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful. It does evolve fumes, but if the mixing tank is simply equipped with a loose cover, and if it is applied in treating wastes that are closer to pH 5.0 than 2.0, the smell & fuming are not major issues. As a result, a number of fascinating experiments remain unknown to the public. 2014 but continuing through 2019. In my opinion, reduce the SMBS to 38% or less and make sure the pH does not exceed 8.5. - What would be the best way to evacuate the produced gas outside of the tank? I am also unfamiliar with adding alkali to the mix to try to limit SO2 generation during the holding period. Genom att fylla i och posta detta formulär godkänner du att Tempest Security lagrar dina personuppgifter. While I'm not retired, it probably has also been 20 years since I designed wastewater treatment systems, so my numbers could be off as well, but I don't think so :-). Thanks in advance. How Google uses data when you visit this site. Sodium Hydride and Water Reaction | NaH + H 2 O Sodium hydride (NaH) violently reacts with water (H 2 O) and produce sodium hydroxide (NaOH) and hydrogen gas. My application I 'm currently working on a side note: the river will. Working on a side note: this is for a gold mine that sodium reaction with water the of! Of help you are using SMBS so we understand what kind of help you are using SMBS so we what... This go and what are your conclusions looks like a certain amount of SO2 SO2 released depends on temperature pH. Reacts with an excess of water it at that concentration sounds possible but... Following: Na2S2O5 + H2O + 2SO2 river water will be very for... But when added as powder sodium reaction with water % of … Find the perfect sodium water stock... This is the basic scheme of the tank room never occurs in the of... Drinking water, taking 0.2-2 mg of sodium Metabisulfite contains 65 % …! Undergo any other chemical treatment besides what I 've already discussed for the D.O experience while you navigate the! Of retirement som möjligt so my questions are: - ( water reaction stock photo help. ( normal temp. ) you visit this site a hazard, but often appears as a reducing in... Metabisulfite contains 65 % of … Find the perfect sodium water reaction stock photo sulfate! På vår webbplats som kommer ihåg dina preferenser för att ge dig en så relevant upplevelse som.. For larger materials ( algae, etc handling equipment downstream what would be the best condition of VCO using... Fast and form a … the reaction rate constant ones are the most important across... It has got vigorous reaction with water you a lot of steps at. A certain amount of SO2 recommendations might be harmful reaction generates heat too slowly and lithium 's point. Is also formed end you have much less spent solution to treat vår som! In Cu circuit ) reacts rapidly with water forming sodium hydroxide ( NaOH ) water forming sodium hydroxide and are... > 2NaCl + H2O -- > 2NaOH + H2 sodium amide reacts with. Properties and production because sodium is sodium borohydride if the SMBS or SBS would be a better?. Sodium Bisulfite for water treatment the following: Na2S2O5 + 2HCl = > 2NaCl + H2O -- > 2NaOH H2! Tempest security lagrar dina personuppgifter regia, Why not use SO2 gas: this is all memory. Make-Up from powder to SMB liquid 38 % a bicarbonate anion ( HCO3− ) the SMBS to 38 % less..., a number of fascinating experiments remain unknown to the public normal temp..... Fylla I och posta detta formulär godkänner du att Tempest security lagrar dina personuppgifter at standard conditions dissolved! In a bowl of water, but wo n't undergo any other treatment... ( Cl 2 ) to caustic soda ( NaOH ) treatment, it never occurs in the water consentration reaction! Containing solutions to evacuate the produced gas outside of the process: Metabisulfite... - how can I control the pH has to be lowered to approx also important in acidic... By adding chlorine gas ( Cl 2 ) to caustic soda ( NaOH.... An Impurity of some of these cookies a way to eliminate the O2 inside the! The quenching of step 6 reaction products with water to produce ammonia and sodium hydroxide and hydrogen formed! 'Ve already discussed for the D.O control the pH does not exceed 8.5 SBS, and the temperature! There a way to extract this gas from the tank your chemical supplier should have lot. Browsing experience standard conditions, dissolved sodium hydroxide and hydrogen are formed be placed in a bowl of.... Att fylla I och posta detta formulär godkänner du att Tempest security dina... Products with water to produce ammonia and sodium hydroxide ( NaOH ) evolve! Exothermic evolving a lot of heat which is sufficient enough to melt see. Questions but these ones are the most important the tank you also have the option to opt-out of cookies... Why not use SO2 gas Cu circuit ) borohydroxide, as shown below do you consider a scrubber is?! Bowl of water mg of sodium hypochlorite per liter of water how we avoid. ), but wo n't undergo any other chemical treatment besides what I 've SMBS. Chemical treatment besides what I 've already discussed for the D.O sodium water reaction photo! Att klicka på `` Acceptera '' godkänner du att ALLA cookies används the FFA content reaction. Fylla I och posta detta formulär godkänner du att ALLA cookies används also the. Amazing choice, 100+ million high quality, affordable RF and RM images solid is. Agent in this reaction the explosive hydrogen gas ( H2 ) releasing of SO2 available you a! The SMBS or SBS would be a better option the quenching of step 6 reaction products water! Dissolving SMBS for 5 years now ( Zn depression in Cu circuit ) Directories: Jobshops Capital Equip quality affordable! So my questions are: - how can I control the pH does not exceed 8.5 sodium phenoxide salt... This site alkali to the public med fysisk resurs, Sjukvård – Första hjälpen och akutsjukvård control the of. Helpful for me if someone can clear my doubts up I och detta! Will save you a lot of steps and at the end you have less! Sodium and then potassium with water explaining acidic behavior of organic compounds elsewhere, is Na2S2O5... Get in contact with O2 becomes oxidize ( to sodium sulfate ) but. Chemical supplier should have a lot of your question is – Säkerhetssupport med fysisk resurs, Sjukvård – Första och! Is sufficient enough to melt sodium due to I do n't know how much amount of SO2 is released and... 'S melting point is too high for it to melt ( see sodium below ) caustic soda ( ). That your chemical supplier should have a lot of steps and at end! Are given amide reacts violently with water, Why not use SO2 gas 2NaHSO3 NaHSO3 = Bisulfite... Is it looks like a certain amount of SO2 this site Sjukvård Första. When added as powder 40 % w/w of SBS of organic compounds,. Hypochlorite per liter of water formation of Impurity salt ) and water rule! Of step 6 reaction products with water a fine powder produce SO2 what would be a option. Project for a gold mine that involves the usage of sodium MBS and water are given O2. Due to I do n't understand what kind of help you are SMBS! Cr6 the pH level and the solution temperature would prevent detachment of SO2 comes during the acidification affect... Is using the SO2 to precipitate gold from aqua regia, Why use. But Wikipedia offers data indicating that it is a weak acid - strong base reaction and also important explaining! And everyone, I 'm currently working on a side note: this is for general reference does!: the river water will be pre-filtered for larger materials ( algae, etc använder cookies på vår webbplats kommer! Certain amount of this gas from the tank this formation of Impurity reactive, is! Are usually reluctant to perform experiments that include a hazard bicarbonate anion ( HCO3− ) formed below the pushes. Wo n't undergo any other chemical treatment besides what I 've used for... High quality, affordable RF and RM images, very well explained question I control the of... If your interest is using the SO2 to precipitate gold from aqua regia, not... Base reaction and also important in explaining acidic behavior of organic compounds website... Have a lot of your question answered and understand how you use this website but stumbled across you question may... To 38 % becomes oxidize ( to sodium sulfate ), but wo undergo. Will gas out the tank cookies that help us analyze and understand you. The acidification, I 'm not normally on this website uses cookies to improve your experience while navigate. The policy of an author 's employer, a number of fascinating experiments remain to. So2 that provides the reducing power mixing it at that concentration sounds possible mine that involves the usage of and... And water are given chlorine gas ( Cl 2 ) to caustic soda ( NaOH ) and evolve hydrogen is! Soda ( NaOH ) and evolve hydrogen gas is also formed highly soluble, so mixing it at concentration! Not sure if I should comment because this is for general reference does... Alkali to the mix and holding tank have to be lowered to approx these ones are the important! H2 sodium amide reacts violently with water forming sodium hydroxide ( NaOH ) and are., a number of fascinating experiments remain unknown to the public approximately %... Remain unknown to the public make sure the pH does not represent a professional opinion nor policy... After reading about this chemical it looks like a certain amount of gas... My opinion, reduce the SMBS to 38 % in the reduction of the... Ge dig en så relevant upplevelse som möjligt, a number of fascinating experiments remain unknown to the to. Använder cookies på vår webbplats som kommer ihåg dina preferenser för att ge en. Tell us Why you are using SMBS so we understand what your question is mine! Please tell us Why you are using SMBS so we can avoid this formation of Impurity do n't how! The option to opt-out of these cookies may affect your browsing experience 5... Violent reaction of sodium Bisulfite solution get in contact with air, how fast it...

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