Question

What do you observe when water is added to quick lime?

Answer 1

The reaction of quick lime with water:

• When water is added to quicklime (CaO), calcium hydroxide [Ca (OH)₂] or slaked lime is formed and a large amount of heat is evolved with a hissing sound in the process.

$\underset{\mathrm{Quick}\mathrm{lime}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Slaked}\mathrm{lime}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{s}\right)(\downarrow )}+\mathrm{Heat}\mathrm{energy}$