Question

What happens when carbon dioxide gas is passed through lime water for a short time?

Write the equation of the reaction involved.

Answer 1

When carbon dioxide gas is passed through lime water, the lime water turns milky due to the formation of a white precipitate of calcium carbonate.

\[\ce{\underset{(Lime water)}{\underset{Calcium hydroxide}{Ca(OH)2_{(aq)}}} + \underset{Carbon dioxide}{CO2_{(g)}} -> \underset{(Makes lime water milky)}{\underset{(White ppt)}{\underset{Calcium carbonate}{CaCO3_{(s)}}}} + \underset{Water}{H2O_{(l)}}}\]