What is the lowest value on the pH scale?

The pH scale, which measures the acidity or alkalinity of a solution, ranges from 0 to 14 under normal conditions, with 7 being neutral. The scale is logarithmic, meaning that each whole number change represents a tenfold change in acidity or alkalinity.

The lowest value on the pH scale is 0, indicating a highly acidic solution. This value represents a very strong acid, such as hydrochloric acid when at high concentrations. Values below 0 are theoretically possible but are not typically encountered in practical situations involving natural solutions or common acids. Understanding that 0 is the minimum limit of the pH scale clarifies why it is the correct answer in this context.