Question

When carbon dioxide gas is passed into limewater,its colour becomes milky. why?

Answer 1

The carbon dioxide gas as it is bubbled through the limewater will react and form insoluble calcium carbonate and water. Hence the milky white color of the floating precipitate.

Answer 2

This white precipitate gives the lime water its milky appearance. Carbon dioxide gas turns lime water milky.Carbon dioxide reacts withcalcium hydroxide(lime water) to formcalcium carbonate , due to which it becomes milky.However, on passing excess of carbon dioxide milkiness disappears.