Which of the following is TRUE? A) An effective buffer has a [base]/[acid] ratio in the range of 10-100. B) A buffer is most resistant to pH change when [acid] = [conjugate base]. C) An effective buffer has very small absolute concentrations of acid and conjugate base. D) The capacity of a buffer cannot be exceeded by adding too much strong base. It can only be exceeded by adding too much strong acid. E) A buffer has the best resistance to pH change when the buffer's pH is significantly lower than the pK_a of the acid used to make the buffer solution.

Question

Quizplus · Accepted Answer

A buffer is most resistant to pH change when [acid] = [conjugate base]. This is because both species can react with any added acid or base, preventing a large change in pH. Choices A, C, D, and E are incorrect because they are either false statements or irrelevant to the effectiveness of a buffer.

Which of the Following Is TRUE