Question

What is the $pH$ of the solution $A$ which liberates $C{O}_2$ gas with a carbonate salt?

• A. Less than $7$
• B. Neutral
• C. More than $7$
• D. The value of $pH$ will vary depending on the concentration of salt formed

Answer 1

The correct option is A Less than $7$

Sodium carbonate is a carbonate salt (basic) which when reacts with acid liberates carbon dioxide. Hence solution $A$ has to be acidic, i.e. $pH<7$.

${Na}_2{CO}_3+2HCl\to 2NaCl+H_{2}O+C{O}_2\uparrow$

Hence, the correct option is $A.$