Which of the following is always true of a buffer prepared using equal concentrations of an acid and its conjugate base? A) pH = 7 B) pH = pK_a C) pH 7 D) none of these

Question

Which of the following is always true of a buffer prepared using equal concentrations of an acid and its conjugate base? A) pH = 7 B) pH = pK_a C) pH > 7 D) none of these

Quizplus · Accepted Answer

A buffer consists of a weak acid and its conjugate base, or a weak base and its conjugate acid. When equal concentrations of the acid and its conjugate base are used, the buffer will have a pH equal to the pKa of the acid. Therefore, the correct answer is B, which states that the pH of the buffer is equal to pKa + log ([conjugate base]/[acid]).

Which of the Following Is Always True of a Buffer