The capacity of a buffer to resist changes in pH upon addition of protons or hydroxide ions depends on A)the pK_a of the weak acid in the buffer. B)the pH of the buffer. C)the total concentration of the weak acid and its conjugate base in the buffer. D)all of the above E)none of the above

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Quizplus · Accepted Answer

All of the listed factors contribute to a buffer's ability to resist changes in pH. The pKa of the weak acid determines its strength, which affects how readily it can donate or accept protons. The pH of the buffer determines the ratio of protonated and deprotonated forms of the weak acid, and affects the direction of proton transfer. The total concentration of weak acid and its conjugate base determines the buffering capacity, or the amount of acid or base that can be added to the buffer without significantly changing its pH.

The Capacity of a Buffer to Resist Changes in PH