How do you purify calcium hydroxide?

Answer 1

You put your left hand in, you put your left hand out, you put your left hand it and shake it all about. Do the hokey pokey, and turn yourself around, and that's how you purify calcium hydroxide.

Answer 2

ADD WATER. The process is called SLAKING. Add water to calcium oxide - sometimes called quicklime, and the result is calcium hydroxide, sometimes called slaked lime.

CaO + H2O = Ca(OH)2

Answer 3

Calcium hydroxide can be purified by recrystallization. Dissolve the calcium hydroxide in water and then slowly cool the solution to promote crystal formation. The impurities will stay in solution while the pure calcium hydroxide crystals can be collected.