Question

1. Washing soda (Na CO.10H 0)
Na CO2 (s) + 10H 0(1) - Na.CO.101.0 (S)
2NaOH + Zn - Na Zn0, +H,​

Answer 1

Addition of common salt to the solution containing NH4+ and HCO3– results in the precipitation of NaHCO3 which is least soluble. It is then filtered off.

NH4HCO3 + NaCl → NH4Cl + NaHCO3

Sodium bicarbonate is then heated to give Na2CO3.

2NaHCO3 → Na2CO3 + CO2 + H2O

The CO2 gas evolved can be