Question
What is the significance (or importance) of pH value?
Solution
The significance of the pH value. pH is a measure of the acidic or basic (alkaline) nature of a solution (concentration of the hydrogen ion [H+] activity in a solution determines the pH).
For neutral solution: pH = 7
For acidic solution: pH < 7
For basic solution: pH > 7
Certain chemical reactions take place at a fixed pH value e.g. fresh cow’s milk (pH = 6·4) turns to the presence of acids produced by the bacteria. The sour milk has a pH 3 to 4.
