What happens when baking soda and sodium chloride are mixed in water?

When sodium bicarbonate (baking soda) and sodium chloride (table salt) are mixed in water, a chemical reaction occurs that produces carbon dioxide gas. This gas forms bubbles that cause the mixture to fizz. The reaction can be represented as follows:

2NaHCO3 + NaCl + H2O → 2CO2 + 2NaCl + H2O

The carbon dioxide gas is responsible for the fizzing action and the bubbles that form when the baking soda and salt are mixed in water. This reaction is commonly used to create bubbles in baking, as the carbon dioxide gas helps to leaven dough and cakes.