Question

In the Electrolysis of Acidulated Water, ______ gas is evolved at cathode

Answer 1

The gas formed at the cathode:-

• The process of using electricity to split water into hydrogen and oxygen is known as electrolysis.
  $\underset{\mathrm{Water}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Hydrogen}}{2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}$
• ${\mathrm{H}}^{+}$ being positively charged moves towards the cathode (negatively charged electrode) that is the Hydrogen gas released at the cathode
• Reaction at the cathode is:

$$\begin{gathered} \mathrm{H}+{\mathrm{e}}^{-}\to +\mathrm{H} \\ \mathrm{H}+\mathrm{H}\to +{\mathrm{H}}_2 \end{gathered}$$

Therefore, in the electrolysis of acidulated water, hydrogen gas is evolved at the cathode