Which pH measurement indicates that water is neutral?

Water is classified as neutral at a pH of 7.0. This is the midpoint of the pH scale, which ranges from 0 to 14. A pH of 7.0 means that the concentrations of hydrogen ions (H⁺) and hydroxide ions (OH⁻) are equal, resulting in a balance that reflects neither acidity nor alkalinity.

Values lower than 7.0, such as 6.0 and 6.9, indicate acidic conditions, where there is a higher concentration of hydrogen ions relative to hydroxide ions. Conversely, a pH higher than 7.0, such as 8.3, indicates an alkaline condition, where there are more hydroxide ions present than hydrogen ions. Thus, a pH of 7.0 is the precise marker for neutrality in water.