Three acids found in foods are lactic acid (in milk products), oxalic acid (in rhubarb), and malic acid (in apples). The pK_a values are LA = 3.88, OA = 1.23, and MA = 3.40. Which list has the conjugate bases of these acids in order of decreasing strength?

Question

Quizplus · Accepted Answer

The strength of a conjugate base is inversely related to the strength of its acid; the weaker the acid (higher pKa), the stronger its conjugate base. Lactic acid has the highest pKa, followed by malic acid, and then oxalic acid, making lactate the strongest conjugate base, followed by malate, and then oxalate.

Three Acids Found in Foods Are Lactic Acid (In Milk