Ascorbic acid (Vitamin C), H₂C₆H₆O₆, has a pK_a of 4.10. A solution is 0.10 M in ascorbic acid and 0.20 M in sodium ascorbate, NaHC₆H₆O₆. What is the approximate pH of the solution? A)4.10 B)slightly less than 4.10 C)slightly more than 4.10 D)The solution will have a pH of exactly 7.

Question

Quizplus · Accepted Answer

Ascorbic acid is a weak acid, so the pH will be slightly higher than its pKa value of 4.10. The presence of the conjugate base, sodium ascorbate, will also contribute to a higher pH. Therefore, the pH of the solution will be slightly more than 4.10.

Ascorbic Acid (Vitamin C), H2C6H6O6, Has a PKa of 4

Ascorbic Acid (Vitamin C), H₂C₆H₆O₆, Has a PK_a of 4