Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 4.6-4.8?

Question

Quizplus · Accepted Answer

To make a buffer solution with an optimum pH of 4.6-4.8, we need to choose a weak acid with a pKa value close to the desired pH. The pKa value of acetic acid, which is the acid in choice A, is 4.76, which is very close to the desired range. Therefore, choice A is the best option for making a buffer solution with an optimum pH of 4.6-4.8. The other options either have pKa values that are too low or too high for the desired pH range.

Assuming Equal Concentrations of Conjugate Base and Acid, Which One