Concept:The pH scale measures how acidic or basic water is, and safe drinking water should be near neutral to slightly alkaline.
Explanation:pH is defined as the negative logarithm of hydrogen ion concentration:
pH=−log[H+].
Drinking water must not be too acidic or too alkaline.
The World Health Organization (WHO) recommends a pH range of
6.5 to
8.5 for drinking water.
Below
6.5, water becomes corrosive and can leach harmful metals from pipes.
Above
8.5, water may taste bitter and cause scaling in pipes and appliances.
Therefore, the desirable pH range for drinking water is
6.5 to
8.5.
Answer:Option A: 6.5 to 8.5