Question

Explain why an aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic (or alkaline). Write chemical equations of the reactions involved.

Answer 1

An aqueous solution of sodium chloride is neutral because it is formed from a strong acid and a strong base. The aqueous solution of sodium carbonate is alkaline because it is prepared from the reaction of a weak acid and a strong base.

\[\ce{Na2CO3_{(s)} + 2H2O_{(l)} -> 2NaOH_{(aq)} + H2CO3_{(aq)}}\]