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Question
Explain the preparation of hydrogen using electrolysis.
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Solution
High purity of hydrogen (>99.9%) is obtained by the electrolysis of water containing traces of acid or alkali or electrolysis of an aqueous solution of sodium hydroxide or potassium hydroxide using a nickel anode and iron cathode. This process is not economical for large-scale production.
- At anode: \[\ce{2OH^- -> H2O + 1/2O2 + 2e^-}\]
- At cathode: \[\ce{2H2O + 2e^- -> 2OH^- + H2}\]
- Overall reaction: \[\ce{H2O -> H2 + 14O2}\]
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