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cn any1 explain me preparation of washing soda?????? plz

 1. CO2 reacts with ammonia to form ammonium carbonate.

2NH3 + CO2 + H2O --> (NH4)2CO3

2.Ammonium carbonate further reacts with CO2 to form ammonium bicarbonate.

(NH4)2CO3 + CO2 + H2O -->  2NH4HCO3 (aq.)

3. Ammonium bicarbonate then react with NaCl to form sodium bicarbonate.

NH4HCO3 + NaCl --> NaHCO3 + NH4Cl

Due to exothermic nature of above reactions, solubility of NaHCO3 increases. To counter this effect , the solution is cooled, ppt of NaHCO3 are separated by vacuum filtration and washed to remove ammonium salts.

4.Dry sodium bicarbonate is then heated to give anhydrous sodium carbonate.Carbon dioxide is then again recirculated.

2NaHCO3  --> Na2 CO3 + CO2 + H2 O

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View Full Answer

 odium carbonate is usually made by the Ammonia-soda process or Solvay process. The raw materials for this process are common salt, ammonia and limestone (for supplying CO2 and quicklime).

When carbon dioxide is passed into a concentrated solution of brine saturated with ammonia, ammonium bicarbonate is produced. The ammonium bicarbonate then reacts with common salt forming sodium bicarbonate.

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Sodium bicarbonate being slightly soluble (in presence of sodium ions) gets precipitated. Precipitated sodium bicarbonate is removed by filtration and changed into sodium carbonate by heating.

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Dear Student,

Sangam and Shubham have posted correct answers.

Hope it is clear to you.

@ Sangam and Shubham,

Good answer!! We really appreciate your contribution to this forum. Keep posting!

Thumbs up to both of you.

Best Wishes!

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yeeee.. yes i liked both d answers so thumbs up 4 both of dem.. yeeeeeeee

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