Explain preparation of hydrogen using electrolysis.

1.	Explain preparation of hydrogen using electrolysis.
Answer» High purity of hydrogen (>99.9%) is obtained by the electrolysis of water containing traces of acid or alkali or electrolysis of 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 : 2OH^- → H₂O + \(\frac{1}{2}\)O₂ + 2e^- At cathode : 2H₂O + 2e^- → 2OH^- + H₂ Overall reaction : H₂O → H₂ + 14 O₂

Answer»

High purity of hydrogen (>99.9%) is obtained by the electrolysis of water containing traces of acid or alkali or electrolysis of 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 : 2OH^- → H₂O + \(\frac{1}{2}\)O₂ + 2e^-

At cathode : 2H₂O + 2e^- → 2OH^- + H₂

Overall reaction : H₂O → H₂ + 14 O₂

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Explain preparation of hydrogen using electrolysis.

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