CHEMISTRY CH14 Acids, Bases and Salts — Science STD 9 — Question

1. Washing Soda (Sodium Carbonate):

• It is used in softening hard water.
• It is used in glass, soap and paper industries.

2. Baking Soda (Sodium bicarbonate -NaHC0₃):

• It is used in making of baking powder which is a mixture of baking soda and tartaric acid.
• It is used in soda-acid fire extinguishers.
• Baking powder is used to make cakes and bread, soft and spongy.
• It neutralizes excess acid in the stomach and provides relief.

3. Bleaching powder (Calcium Oxychloride – CaOCl₂)

• It is used as disinfectant.
• It is used in textile industry for bleaching cotton and linen.

4. Plaster of Paris (Calcium Sulphate Hemihydrate – CaS0₄ . 1/2H₂0)

• It is used for plastering bones
• It is used for making casts for statues