When the concentration of the acid and conjugate base components of a buffer are present in exactly equimolar proportions A) the buffer is very limited in capacity to absorb either acid or base B) the buffer has no capacity to absorb any added acid C) the buffer has no capacity to absorb any added base D) the buffer has a useful range of pH 6.5 - pH 7.5 E) the pH of the buffer solution is equal to the pK_a of the acid component of the buffer

Question

Quizplus · Accepted Answer

When the concentration of the acid and conjugate base components of a buffer are present in exactly equimolar proportions, the pH of the buffer solution is equal to the pKa of the acid component of the buffer. This is a direct consequence of the Henderson-Hasselbalch equation.

When the Concentration of the Acid and Conjugate Base Components