Which pH value represents a neutral solution?

A pH value of 7 represents a neutral solution, which is a fundamental concept in acid-base chemistry. The pH scale ranges from 0 to 14, where values below 7 indicate acidity and values above 7 indicate alkalinity (basicity). At a pH of 7, the concentration of hydrogen ions ((H^+)) is equal to the concentration of hydroxide ions ((OH^-)), resulting in a balanced state that defines neutrality. This is particularly important in biological systems and chemical reactions, as many processes rely on maintaining a neutral pH.

Both extremes of the scale—0, which represents strong acidity, and 14, which represents strong basicity—are not neutral. Additionally, a pH of 3 indicates an acidic solution, further confirming that a pH of 7 is indeed the defining mark of neutrality in aqueous solutions.