Question

Write the chemical formula of quick lime and slaked lime.

Answer 1

Part 1: Quick lime

• The chemical formula of quick lime is $\mathrm{CaO}$.
• It is a white crystalline solid.
• It can be obtained by the decomposition of calcium carbonate.

$\underset{\mathrm{Calcium}\mathrm{carbonate}}{{\mathrm{CaCO}}_3\left(\mathrm{s}\right)}\stackrel{\mathrm{heat}}{\to }\underset{\mathrm{Calcium}\mathrm{oxide}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}$

Part 2: Slaked lime

• The slaked lime is the common name for calcium hydroxide.
• The chemical formula for slaked limes is $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$.
• The slaked lime can be obtained by the reaction of calcium oxide with water.

$\underset{\mathrm{Calcium}\mathrm{oxide}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Calcium}\mathrm{hydroxide}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{aq}\right)}+\mathrm{Heat}$