Question

write the prepairation form-
(i) Baking soda
(ii) Washing soda
(iii) Bleaching powder
(iv) Plaster of paris

Answer 1

(i) Baking Soda

NaCl + NH3 + H2O + CO2 ----> NaHCO3 + NH4 Cl
2NaHCO3 ---heat---> Na2CO3 + CO2 + H2O.


(ii) washing soda

2NaHCO3 ---heat---> Na2CO3 + CO2 + H2O
Na2CO3 + 10 H2O ---> Na2CO3.10H2O


(iii) bleaching powder

Ca(OH)2 + Cl2 ---> CaOCl2 + H2O


(iv) plaster of Paris

CaSO4.2H2O ---heat at 100°C---> CaSO4.1/4H2O + 1 1/2 H2O

2(CaSO4.2H2O) -----heat at 100°C----> 2CaSO4.H2O + 3H2O