Question

The addition of solid sodium carbonate to pure water results in :

(a) an increase in H⁺ ion concentration 

(b) an increase in pH 

(c) no change in pH 

(d) a decrease in OH^- concentration

Answer 1

(B) an increase in pH

\(Na_2CO_3+H_2O\longrightarrow 2NaOH+H_2O+CO_2\)

on hydrolysis of \(Na_2CO_3\) gives \(NaOH\) solution, water and Carbon dioxide gas.

We know that, \(NaOH\) is a strong base.

it means the \(P^H\) of pure water increase.

Answer 2

Option : (b) an increase in pH