Yes, acids neutralize alkaline ingredients like baking soda through a chemical reaction called neutralization, producing salt, water, and often carbon dioxide. This reaction reduces the pH of the mixture, bringing it closer to neutral.
Acids and bases (alkaline substances) are chemical opposites. When they react, they cancel out each other's properties in a process called neutralization. Baking soda (sodium bicarbonate) is a common alkaline ingredient. When an acid, such as vinegar (acetic acid) or lemon juice (citric acid), is added to baking soda, a chemical reaction occurs.
The acid donates hydrogen ions (H+) and the base accepts them. This reaction forms a salt (like sodium acetate if using vinegar), water (H2O), and carbon dioxide (CO2). The carbon dioxide is what causes the fizzing or bubbling you see when baking soda and vinegar are mixed.
The overall effect is a reduction in the pH of the mixture. A pH of 7 is neutral; values below 7 are acidic, and values above 7 are alkaline. By adding an acid to baking soda, you lower the pH, moving it closer to 7 and thus neutralizing the alkaline properties of the baking soda. The amount of acid needed depends on the amount and strength of the alkaline substance.
When using acid to neutralize baking soda in a recipe, add the acid slowly and in small increments. This prevents excessive fizzing and ensures the reaction is controlled, preventing the loss of too much carbon dioxide which can affect the texture of your baked goods.