Which of the following statements about `pH` and `H^(+)` ion concentration is incorrect ?

Options

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

B

Explanation

`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.