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

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Solution

We know that sodium carbonate is a salt that is basic in nature, that is it will react with acids to form salts (neutralisation reaction) and when dissolved in water, its solution will have a pH more than 7. So a substance that can liberate carbon dioxide from sodium carbonate will be acidic in nature and hence its pH will be less than 7. Following is the equation that is expected to take place:

Na₂CO₃ + H⁺ → 2Na⁺ + H₂O + CO₂(↑)

For example, hydrochloric acid (HCl), which is acidic in nature reacts with Na₂CO₃, which is basic in nature as per the following equation:

Na₂CO₃ + HCl → 2NaCl + H₂O + CO₂(↑)

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