What is the pH of a buffer solution containing 0.155 mol dm^-3 of benzoic acid and 0.315 mol dm^-3 sodium benzoate. (K_a of benzoic acid is 4.20.)

Question

Quizplus · Accepted Answer

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation:pH = pKa + log([A-]/[HA])where pKa is the negative logarithm of the acid dissociation constant, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid.In this case, the pKa of benzoic acid is 4.20, the concentration of the conjugate base (sodium benzoate) is 0.315 mol dm-3, and the concentration of the acid (benzoic acid) is 0.155 mol dm-3.Substituting these values into the Henderson-Hasselbalch equation, we get:pH = 4.20 + log(0.315/0.155) = 4.51Therefore, the pH of the buffer solution is 4.51.

What Is the PH of a Buffer Solution Containing 0