Write the chemical name and formula of common salt . State how sodium hydroxide is prepared using this salt.

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Solution

The chemical name of common salt is sodium chloride and its formula is NaCl.

Sodium hydroxide (NaOH) is prepared by the salt sodium chloride via electrolysis known as chlor-alkali electrolytic method. In this process chlorine gas is given of at the anode and hydrogen gas at the cathode. Sodium hydroxide solution is formed near the cathode.

2NaCl + 2H₂O ---> Cl₂ + 2NaOH +H₂

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