Preparation : Prepared by the method called chlor-alkali process. It is called so because we get chlorine and a base in this process.
• Calcium oxy chloride – CaOCl
Common Name : Bleaching Power
use in textile, factories and laundry, used as disinfectant
• Sodium Hydrogen Carbonate – NaHCO3
– Common name – Baking Soda
On heating NaHCO3 produces :
CO2 produced causes dough to rise and make cakes, pastries spongy.
Uses : In household, ingredients of antacid
In making baking power On heating baking powder produces
• Sodium Carbonate – Na2CO3
Common name : Washing Soda
Preparation : Recrystallisation of sodium carbonate
Uses
– Used in glass, soap and paper industry
– Cleaning agent for domestic purposes.
– Removal of hardness of water.
– Manufacturer of borax.
Common Name : Plaster of Paris Calcium Sulphate hemihydrate
• Water of crystallisation : Fixed no. of water molecules present in one formula unit of a salt.
– On heating copper sulphate crystals water droplets appear, formula of hydrated copper sulphate – CuSO4. 5H2O.
– gypsum also contains water of crystallisation. CaSO4.2H2O
– Preparation : On heating gypsum at 373K it becomes
– When Plaster of Paris is mixed with water it changes to gypsum.
Uses of plaster of Paris : Making toys, decorative material and smooth surfaces, plaster for fracture bones.
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