Synthesize a scenario where the addition of a weak acid to a solution containing sodium carbonate increases the solubility of carbonic acid.

• A. The weak acid has no effect on the solubility of carbonic acid.
• B. The weak acid donates protons, converting carbonate ions to carbonic acid, increasing solubility.
• C. The weak acid forms a precipitate with carbonate ions, decreasing solubility.
• D. The weak acid increases the pH, decreasing solubility.

Answer: (B)