Question

What can you say about the pH of a solution that liberates carbon dioxide from sodium carbonate?

Answer 1

1. Acids

Acids are generally sour in taste. The pH value for acids ranges from 0 to less than 7. When a metal carbonate reacts with an acid, then salt, water, and carbon dioxide are produced as a result.

2. Explanation for pH of a solution

When Sodium carbonate $\left({\mathrm{Na}}_2{\mathrm{CO}}_3\right)$ reacts with an acid, then Salt, Water, and Carbon dioxide gas are liberated. The chemical equation is:

$$\begin{gathered} {\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to 2\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ \mathrm{Sodium}\mathrm{Hydrochloric}\mathrm{Sodium}\mathrm{Carbon}\mathrm{Water} \\ \mathrm{carbonate}\mathrm{acid}\mathrm{chloride}\mathrm{dioxide} \end{gathered}$$

Thus, this property is displayed by acids only.

Therefore, the pH of the given solution will be less than 7.