what are the different steps of Solvay's process for the manufacture of washing soda? give its important uses.

The different steps used in solvey's process is given as:

Step 1:  The calcium carbonate is heated at 950 - 1100 °C to produce carbon dioxide gas  as

CaCO₃ -> CO₂ + CaO

Step 2:, CO₂ passes through a concentrated aqueous solution of sodium chloride (NaCl) called as brine and ammonia (NH₃).

NaCl + CO₂ + NH₃ + H₂O -> NaHCO₃ + NH₄Cl 

Step 3:  The ammonium chloride (NH₄Cl) is filtered from step2 solution, and the solution is then reacted with the calcium oxide (CaO).

2NH₄Cl  + CaO -->  2NH₃ + CaCl₂ + H₂O

Step 4:  The sodium bicarbonate precipitated from the solution of step2, is then heated (calcination) at 160 - 230 °C to produce washing soda (Sodium carbonate) as:

2NaHCO₃ --> Na₂CO₃ +  H₂O  +CO₂  

Use : It is used in glass making, softening of water, preparation of soap and detergents and as common alkali in many chemical factories as it is cheaper.