Why carbon di oxide evolves when carbonated water reacts with sodium chloride?

Answer 1

First: sodium chloride does NOT react with water, H2O, nor with carbon dioxide, CO2.

However when some fine salt particles are put in a glass of carbonated water, a lot of gas bubbles evolve from the dissolving particles.

When completely dissolved almost nothing will occur. How come?

At the 'liquid (carbon. water) / solid (salt part'ls)' interface there will be a 'struggle' for water molecules, won by the much more soluble salt particles, lost by the rather badly soluble gas molecules. That's how those carbon dioxide molecules are 'stripped off' their surrounding -solublizing- water molecules, now only capable of 'sticking' together in (escaping) gas bubbles.

Answer 2

Carbon dioxide evolves when carbonated water reacts with sodium chloride because the carbonate ions in the water can react with the sodium ions in sodium chloride to form carbon dioxide gas. This reaction results in the release of carbon dioxide bubbles.