Not all liquids can be classified strictly as acids or bases. The pH scale, which ranges from 0 to 14, measures the acidity or basicity of a solution. Acids have a pH less than 7, while bases have a pH greater than 7. A pH of 7 is considered neutral, which indicates that a liquid is neither an acid nor a base.
Examples of neutral liquids include pure water and many organic solvents. Some solutions may also fall within the neutral range, meaning they do not exhibit the properties of either acids or bases. Thus, while many common liquids are acids or bases, such as vinegar or bleach, there are also plenty of liquids that do not fit into these categories.