Question

Write preparation and uses of sodium hydrogen carbonate​ (i) bleaching powder (ii) plaster of Paris (iii) washing soda (iv) baking soda

Answer 1

Sodium hydrogen carbonate :

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

Bleaching powder : calcium oxichloride

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

Uses; oxidising agent in chemical industries, to make drinking water free of germs.

Plaster of Paris :calcium sulphate hemihydrate

CaSO4. 1/2H2O

On heating gypsum at 373k, it loses water molecules and become plaster of Paris.

Uses; doctors use as plaster for supporting fractured bones, used for making toys materials for decorating.

Washing soda :

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

Uses; used in glass, soap and paper industry, manufacture of borax, removing permanent hardness of water.

Baking soda :

NaCl+H2O+CO2+NHe------ NH4Cl+NaHCO3

Uses; ingredient in antacids,used in soda acid fire extinguisher