Question

Write a balanced chemical equation for the following:

Action of heat on aluminium hydroxide.

Answer 1

• When aluminium hydroxide $\left[\mathrm{Al}{\left(\mathrm{OH}\right)}_3\right]$ is heated, it decompose to form aluminium oxide $\left({\mathrm{Al}}_2{\mathrm{O}}_3\right)$ and water $\left({\mathrm{H}}_2\mathrm{O}\right)$.
• This type of reaction is known as thermal decomposition (decomposition of a substance by the action of heat).

$2\mathrm{Al}{\left(\mathrm{OH}\right)}_3\left(\mathrm{s}\right)\stackrel{∆}{\to }{\mathrm{Al}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$