If a buffer is made up using 1.00 mole of a weak acid (pK_a = 5.00) and 0.90 mole of its conjugate base, which of the following must be true? A) pH 5.00 D) pH = 7.00 E) pH 7.00

Question

If a buffer is made up using 1.00 mole of a weak acid (pK_a = 5.00) and 0.90 mole of its conjugate base, which of the following must be true? A) pH < 5.00 B) pH = 5.00 C) pH > 5.00 D) pH = 7.00 E) pH > 7.00

Quizplus · Accepted Answer

Since the concentration of the weak acid is slightly higher than that of its conjugate base, the pH will be slightly less than the pKa, which is 5.00.

If a Buffer Is Made Up Using 1