Question

Which gas turns lime water milky?

Answer 1

Carbon dioxide gas turns the lime water milky.

• When carbon dioxide passes through lime water $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$, Calcium Carbonate is formed.
• Therefore, limewater turns milky.
• $$\begin{gathered} \mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)\to {\mathrm{CaCO}}_3\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ (\mathrm{Lime}\mathrm{Water})(\mathrm{Carbon}\mathrm{Dioxide})(\mathrm{Calcium}\mathrm{Carbonate})\left(\mathrm{Water}\right) \end{gathered}$$