Question

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

Answer 1

The chemical formula of lime water: $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

1. When we pass carbon dioxide through lime water for a short duration, a white calcium carbonate precipitate forms and it turns into lime water milky.
2. Chemical reaction can be written as:

$\underset{(\mathrm{Calcium}\mathrm{hydroxide})}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}+\underset{(\mathrm{Carbon}\mathrm{dioxide})}{{\mathrm{CO}}_2}\to \underset{\left(\mathrm{Calcium}\mathrm{carbonate}\right)}{{\mathrm{CaCO}}_3}+\underset{\left(\mathrm{Water}\right)}{{\mathrm{H}}_2\mathrm{O}}$