The pK₁ of citric acid is 3.09.What is the citric acid : monosodium citrate ratio in a 1.0 M citric acid solution with a pH of 2.09?

Question

Quizplus · Accepted Answer

The ratio of citric acid to monosodium citrate in a solution can be determined using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the base form (monosodium citrate) and [HA] is the concentration of the acid form (citric acid). Given the pH is 2.09 and the pKa is 3.09, substituting these values into the equation gives: 2.09 = 3.09 + log([A-]/[HA]). Solving for the ratio [A-]/[HA] gives approximately 0.1, which means the ratio of citric acid to monosodium citrate is about 10:1.

The PK1 of Citric Acid Is 3

The PK₁ of Citric Acid Is 3