Question

Bleaching powder forms a milky solution in water.Explain

Answer 1

when bleaching powder is mixed in water,it reacts with carbon dioxide from air to form calcium carbonate which gives milkiness to the solution

CaOcl2 + H20 ---> caO + HCl

Answer 2

Bleaching powder is the salt of calcium that is also named as calcium hypochlorite.  

When bleaching powder is mixed in water to form calcium hydroxide (a calcium salt) and HOCl acid. Here HOCl is an unstable acid which further release chlorine gas. Here milky appearance is due to calcium hydroxide.  

The chlorine gas acts as bleaching action and bleach the substance present in it.  

$\bold{\mathrm{Ca}(\mathrm{OCl})_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Ca}(\mathrm{OH})_{2}+2 \mathrm{HOCl}}$