Question

Write the chemical name , formula , preparation method and uses of

(i) Bleaching powder (ii) Washing powder (iii) Plaster of Paris​

Answer 1

Answer:

Bleaching Powder's chemical formula is CaOCl2 and is called Calcium Oxychloride. It is prepared on dry slaked lime by chlorine gas.

It is prepared by Solvay's process. (1) A cold and concentrated solution of sodium chloride is reacted with ammonia and carbon dioxide to obtain sodium hydrogen carbonate. (2) Sodium hydrogen carbonate is separated by filtration,dried and heated. Oh heating sodium hydrogen carbonate decomposes to form sodium carbonate.

Calcium sulphate with half a molecule of water per molecule of the salt (hemi-hydrate) is called plaster of paris (plaster of paris). It is prepared by heating gypsum (CaSO4. 2H2O) at 120°C in rotary kilns, where it gets partially dehydrated.

hope this is helpful to you..!!:)

Answer 2

Answer:

I agree with above answer