What pH value indicates a neutral solution?

A pH value of 7 indicates a neutral solution. This value is significant because it represents the point at which the concentration of hydrogen ions (H+) in the solution is equal to the concentration of hydroxide ions (OH-). In pure water, which is considered a standard for neutrality, these ions are present in equal amounts at this pH.

The pH scale ranges from 0 to 14, where values below 7 represent acidic solutions (with higher concentrations of H+ ions) and values above 7 represent basic or alkaline solutions (with higher concentrations of OH- ions). Therefore, a pH of 7 is the optimal marker for neutrality, making it an important reference point in chemistry and biology when assessing the acidity or alkalinity of various substances.