An acid-base indicator is a substance that changes color as the pH of the solution changes. Indicators work because they are weak acids which when in solution, exist in equilibrium with their ...

Neutralisation is the reaction of an acid with a base that results in the pH moving towards 7. It is a useful process that occurs in everyday life such as in the treatment of acid indigestion and ...

In this is acidic baking soda acts as a base, with a pH of 9, while vinegar is the acid, with a pH of 2 or 3. The pH scale ranges from 0.0 to 6.9 for acids, 7.0 for neutral, and 7.1 to 14.0 for bases.