Sodium Meta biSulphate : preparation , physical and chemical properties , pharmaceutical uses , incompatibility.

 

 Sodium meta bisulphate [Na₂S₂O₅]

Or

Sodium puri sulfate, 

Na₂S₂O₅ commercially produced salt of sulphurous acid, is a preservative used to extend the shelf life of meat products such as fresh sausages and burgers, even though it can have adverse effects on some people, especially asthmatics.Na₂S₂O₅ is not permitted in several countries for use in meat products. Chemically, Na₂S₂O₅ 67% sulphur dioxide (SO2). When SMBS is applied to a meat product, the Na₂S₂ reacts with water and, as a rule of thumb, around 50–55% added Na₂S₂O₅ can be found analytically in the meat product as SO2. Some SO2 is ‘lost’ as a result of countless reactions and cannot be detected any longer. Therefore meat products are not analysed with regard to their Na₂S₂O₅ content. The level of SO2 has to be measured instead and food standards refer to the SO2 level, rather than the Na₂S₂O level, of a product. 


*Preparation*

Sodium meta bi sulphate is produced by passing Sulphur Dioxide into a hot concentrated sodium hydroxide solution and saturated it .
 makes sodium bisulfate which is converted into a sodium meta bi sulphate.

NaOH  + SO₂  → NaHSO₃

2NaHSO₃  → Na₂S₂O₅ + H₂O


physical property

*It is colourless Prismatic crystalline powder which may become yellowish on keeping.

* its odour like Sulphur and saline taste.

* it is a powerful reducing agent.

* it is freely soluble in water.

Chemical property

*On heating it  decomposes into sodium sulphide and Sulphur dioxide.

Na₂S₂O₅  → Na₂SO₃ + SO₂ 


* it reduces iodine per magnet , dichromatic ferric salt .


2I₂ + Na₂S₂O₅ +3H₂O  → 4HI + 2NaHSO₄



Pharmaceutical uses


* it is used in laboratory.

* it is powerful reducing agent .

*it is used and antioxidant in pharmaceutical preparation to stabilize injection containing salt, adrenaline, apomorphine.

* it is used as anti microbial preservative.

*It is also used in preparation of photographic develops .

* it is used an antichlor (after bleaching paper or cloth with chlorine).

Chemical incompatibility

Since it is reducing so it reduce halogen and paramagnet.

2I₂ + Na₂S₂O₅ +3H₂O  → 4HI + 2NaHSO₄



Storage condition

It should be kept in well closed container because it is a reducing agent.





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