Question

“Dissolution of quick lime in water is an exothermic reaction.” Explain.

Answer 1

An Exothermic reaction is a chemical reaction that involves the release of energy in the form of heat or light.

This can be expressed in a chemical equation as follows:

Reactants → Products + Energy

• When quick lime(Calcium oxide) is dissolved in water it forms slaked lime(Calcium hydroxide).
• This process is highly exothermic as a lot of heat is produced, this heat raises the temperature due to which mixture becomes very hot.
• If this process is formed in a plastic bucket it tends to melt.

Hence, it is an example of an exothermic process.

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