Calculate the approximate pH of a 0.10 M lactic acid solution.
(K_a = 8.4 x 10^-4)

Question

Calculate the approximate pH of a 0.10 M lactic acid solution. (K_a = 8.4 x 10^-4)

Quizplus · Accepted Answer

The pH of a 0.10 M lactic acid solution can be calculated using the Henderson-Hasselbalch equation:pH = pKa + log([A-]/[HA])where pKa is the acid dissociation constant, [A-] is the concentration of the conjugate base (lactate ion), and [HA] is the concentration of the acid (lactic acid).Substituting the given values into the equation:pH = -log(8.4 x 10^-4) + log([A-]/[HA])We can assume that the concentration of the conjugate base is negligible compared to the concentration of the acid, so:pH = -log(8.4 x 10^-4) + log(0)pH = 2.0

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