Question

Which gives carbon dioxide on heating slaked lime or limestone?

Answer 1

Heating limestone

• When limestone (Calcium carbonate) is heated, formation of calcium oxide and carbon dioxide takes place.
• The chemical equation is shown below.

${\mathrm{CaCO}}_3\left(\mathrm{s}\right)\to \mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)$

Heating Slaked lime

• Heating slaked lime, $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$ does not produces carbon dioxide gas.