II. Choose one correct answer for the following questions
61. Which one is CORRECT for buffer capacity of a solution?
(A) It is defined as the number of moles of a strong acid or a strong base that cause 1 mL of the buffer to undergo a1.00-unit change in pH.
(B) It depends only on the total concentration of buffers, not on their concentration ratio.
(C) The pKa of the acid chosen for a given application should lie within ± 1 unit of the desired pH for the buffer.
(D) A buffer solution of any desired pH can be prepared by combining calculated quantities of buffer pair, no need anyadjustment.
(E) Dissociation constants would not interfere with the predicted pH values.