Question

The pH of lemon juice is:
(A) 4
(B) 10
(C) 7
(D) 2.2 to 2.4

Answer 1

The pH of the solutions varies from 1 to 14; 1 to 6 for acids, 7 for neutrals and 8 to 14 for bases. If any solution contains acids only, then the pH will definitely not cross the limit of 7. For strong acids, pH value varies from 1 to 3 and for mild acids, it varies from 4 to 6.

Complete answer:
Let us study some facts about lemon juice;
The juice of lemon consists of two acids i.e. 5 to 8 % citric acid (which gives the tart flavour) and ascorbic acid (also known as vitamin C). Due to this property, biting into lemon juice can damage the tooth enamel; though drinking lemon juice cannot change the pH of the body.
Lemon juice consumption increases the acidity of urine but the pH of blood is maintained to the near values of 7 regardless of how much lemon juice is taken into the body.
Looking towards the acidity of the lemon juice, it has been recognized with the pH between 2 to 3.

Thus, option (D) 2.2 to 2.4 is correct.

Note:
Do note that the lemon contains acids; thus, the option like (B) 10 can never be your answer. For time being, we can take option (C) into consideration till we reach the answer perfectly; otherwise, both the options i.e. (B) and (C) are illogical and can be ignored from the start.