A buffer solution is 0.500 M in acetic acid and 0.500 M in sodium acetate. Its pH is 4.74. What is its pH after dilution by a factor of 2?
A) 4.44
B) 4.49
C) 4.74
D) 4.99
E) 5.04

Question

Quizplus · Accepted Answer

The pH of a buffer solution depends on the ratio of the concentration of the weak acid and its conjugate base, not on their absolute concentrations. Diluting both components by the same factor does not change their ratio, hence the pH remains the same.

A Buffer Solution Is 0