A buffer solution is prepared by taking 0.250 moles of acetic acid (pK_a = 4.76)and 0.400 moles of barium acetate in sufficient water to make 1.400 liters of solution. Calculate the pH of this solution.

Question

Quizplus · Accepted Answer

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). Here, [A-] is the concentration of acetate ion, and [HA] is the concentration of acetic acid. [A-] = 0.400 moles / 1.400 L = 0.286 M, [HA] = 0.250 moles / 1.400 L = 0.179 M. pH = 4.76 + log(0.286/0.179) = 5.27.

A Buffer Solution Is Prepared by Taking 0