Question

Write the equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid

Answer 1

Nitric acid is prepared from potassium nitrate and concentrated sulphuric acid by producing one more product that is potassium hydrogen sulphate.

$\underset{\mathrm{potassium}\mathrm{nitrate}}{\underset{}{{\mathrm{KNO}}_3\left(\mathrm{s}\right)}}+\underset{\mathrm{conc}\mathrm{sulphuric}\mathrm{acid}}{\underset{}{{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{l}\right)}}\stackrel{200°\mathrm{C}}{\to }\underset{\mathrm{potassium}\mathrm{hydrogen}\mathrm{sulphate}}{\underset{}{{\mathrm{KHSO}}_4\left(\mathrm{s}\right)}}+\underset{\mathrm{nitric}\mathrm{acid}}{\underset{}{{\mathrm{HNO}}_3\left(\mathrm{l}\right)}}$