Question

Sodium carbonate is a basic salt because it is a salt of

• A. strong acid and strong base
• B. weak acid and weak base
• C. strong acid and weak base
• D. weak acid and strong base

Answer 1

The correct option is D

weak acid and strong base

Explanation:

Sodium carbonate:

• Salt hydrolysis is the reaction of salt with water to produce the acid and base from which salt is made.
• The hydrolysis of sodium carbonate can be represented as:

$\underset{\mathrm{Sodium}\mathrm{carbonate}}{{\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Sodium}\mathrm{hydroxide}}{2\mathrm{NaOH}\left(\mathrm{aq}\right)}+\underset{\mathrm{Carbonic}\mathrm{acid}}{{\mathrm{H}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)}$

Hence, Sodium carbonate is a basic salt as it is composed of a strong base Sodium hydroxide and weak acid Carbonic acid.

Hence option (D) is correct.