Question

Which of the following statements about pH and `H^(+)` ion concentration is incorrect ?
A. Addition of one drop of concentrated HCl in `NH_(4)OH` solution decreases pH of the solution
B. A solution of the mixture of one equivalent of each of `CH_(3)COOH` and NaOH has a pH of 7.
C. pH of pure neutral water is not zero
D. A cold and concentrated `H_(2)SO_(4)` has lower `H^(+)` ion concentration than a dilute solution of `H_(2)SO_(4)`.

Answer 1

Correct Answer - B
`CH_(3)COOH` is weak acid while NaOH is strong base, so one equivalent of NaOH cannot be neutralised with one equivalent of `CH_(3)COOH`. Hence, one equivalent of each does not have pH value 7. As the NaOH is a strong base, the solution will be basic having a pH more than 7.