Question

steps to production of Washing soda

Answer 1

Washing soda is prepared by recrystallisation of sodium carbonate....

Na2CO3 + 10H2O -----> Na2CO3.10H2O

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Answer 2

What is Washing soda [ N a 2 C O 3 .10 H 2 O ] ?

Washing soda finds its application in numerous ways, be it from household uses to a vast range of industrial applications. It is an alkaline compound with a high alkaline character which has the capability to remove adamant stains from clothes during washing. Chemically washing soda is a hydrated salt of sodium carbonate with a chemical formula – N a 2 C O 3 .10 H 2 O

Solvay Process- Preparation of Sodium Carbonate

Steps involved in the manufacture of sodium carbonate are explained below:

Purification of Brine

Formation of sodium hydrogen carbonate

Formation of sodium carbonate

Recovery of ammonia

Step 1: Purification of Brine

Concentrated brine is obtained by the process of evaporation and impurities like calcium, magnesium etc are removed by the process called precipitation. The concentrated brine solution undergoes filtration and is mixed with ammonia in the ammonia tower and the ammonia tower gets cooled.

Step 2: Formation of sodium hydrogen carbonate

In a carbonate tower, carbon dioxide is passed through ammoniated brine solution.

N H 3 (aq)+C O 2 (g)+NaCl(aq)+ H 2 O→NaHC O 3 (s)+N H 4 Cl(aq)

Step 3: Formation of sodium carbonate

Sodium Bicarbonate formed is obtained from the tower and is heated at a temperature of 300°C. Hence formations of sodium carbonate take place.

2NaHC O 3 →N a 2 C O 3 +C O 2 + H 2 O

Step 4: Recovery of ammonia

Ammonia can be recovered by treating the solution of NH4Cl with Ca (OH)2. This ammonia is again used in the Solvay process and CaCl2 is obtained as a by-product.

2N H 4 Cl+Ca(OH ) 2 →2N H 3 +CaC l 2 + H 2 O