What is the pH value of distilled water ideally supposed to be?

The ideal pH value of distilled water is seven. A pH of seven is considered neutral on the pH scale, which ranges from 0 to 14. This scale measures the acidity or alkalinity of a solution; values below seven indicate acidity, while values above seven indicate alkalinity.

Distilled water is purified through the process of distillation, which removes impurities and dissolved gases that could affect its acidity. When freshly distilled and free from contaminants, it typically has a pH that is very close to neutral. However, it is important to note that when distilled water is exposed to air, carbon dioxide can dissolve in the water, forming carbonic acid, which can slightly lower its pH. Despite this, the ideal target pH remains around seven, reflecting the property of distilled water as a baseline reference point in chemistry.