Sodium nitrite : Preparation , Physical & Chemical Property , pharmaceutical uses , storage condition.

 

   Sodium nitrite 

         [NaNO₂]


Sodium nitrite is similar in name and use to sodium nitrate. Both are preservatives used in processed meats, such as salami, hot dogs, and bacon. Sodium nitrite has been synthesized by several chemical reactions that involve the reduction of sodium nitrate. Industrial production of sodium nitrite is primarily by the absorption of nitrogen oxides into aqueous sodium carbonate or sodium hydroxide. Over the years, sodium nitrite has raised some concerns about its safety in foods, but it remains in use and there are indications that it may actually be healthy.


Preparation

* sodium nitrite is usually obtained by strongly heating sodium nitrate.

2NaNO₃  →  2NaNO₂  + O₂


* oxidation of catalytic ammonia is sodium carbonate solution on absorption gives sodium nitrite.

2Na₂CO₃+ 4NO + O₂ → 4NaNO₂ + CO₂

Physical property


* it is a white or yellow granular powder or stick.

*it is odourless and saline test.

* It has nature  hydroscopic (moisture absorption) 

* it have melting point 271 ℃.

* it is soluble in water.

Chemical property


* sulphuric acid react with sodium nitrite solution and form nitrous acid.

2NaNO₂ + H₂SO₄ → Na₂SO₄ + 2HNO₂


* as reducing agent it reduces picramate per magnet and halogens it change molecular form to iron form.

2KmNO₄ + 5 NaNO₂ +H₂SO₄  → 5NaNO₃ +K₂SO₄                                                       + 2MnSO₄ + 3H₂O


Pharmaceutical uses


* it is used in laboratory.

* it is an antioxidant.

* it is a reducing agent.

* it is used as a treatment of Cyanide poisoning.

* it is used as preservative for food such as curd, meat.

* it is used for manufacturing dies ,photographs and vasodilators.

Storage condition 

It used be stored in tightly closed container.






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