Pure dihydrogen (99.5 %) is obtained by the electrolysis of
Pure dihydrogen (99.5 %) is obtained by the electrolysis of
$\mathrm{NaOH}_{(\mathrm{aq})}$ using $\mathrm{Zn}$ electrode
pure water
dil. $\mathrm{H}_2 \mathrm{SO}_4$ using cadmium electrodes
warm barium hydroxide using $\mathrm{Ni}$ electrodes
Solution
- In the laboratory, high purity compounds can be obtained only with electrolysis.
- $\quad$ Similarly, highly purified dihydrogen is also obtained by electrolyzing water using a small amount of acid or base.
- Here, $\mathrm{Ba}(\mathrm{OH})_2$ is a base. Hence, electrolyzing water in the presence of a base $\mathrm{Ba}(\mathrm{OH})_2$ gives us the highly purified (> $99.95 \%$ ) Dihydrogen $\left(\mathrm{H}_2\right)$ using Ni electrodes.