Method of preparation of bleaching powder?

Answer 1

in laboratory bleaching powder can be prepare by shaking slaked lime with a gas jar of chloine

on large bleaching poweder can be prepare on two methods

1: Hasenclever method

2: Beckmanns method

Answer 2

It is manufactured by the action of chlorine on dry slaked lime, Ca(OH)2 at 40oC.

This is the Odling view about its formation. There is another view proposed by Clifford according to which bleaching powder is a mixture of calcium hypochlorite and basic calcium chloride.