Which of the following solutions will resist change in their pH on moderate dilution?

Options

A. A solution which is 0.1 M in `PhNH_(2)` and 0.2 M in `PhNH_(3)^(+)Cl^(-)`
B. 0.1 M `NaHCO_(3)`
C. A solution obtained by mixing equal volumes of 0.1 M NaOH and 0.2 M PhOH.
D. 0.4 M `CH_(3)COONH_(4)`

Answer

A, B, C, D

Explanation

Buffer solution, solutions of amphi-protic species and solutions of salts of weak acid `+` weak base resist change in their pH on dilution. A is buffer B is amphiprotic species. C is buffer solution of phenol and phenoxide. D is salt of weak acid `+` weak base.