Problem: Consider the following curve for the titration of a weak base with a strong acid and answer each of the following questions.At what volume of added acid does pH = 14 – pKb?        

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FREE Expert Solution

At 1/2 equivalence point: pH = pKa

pKa + pKb = 14

So we know that at 1/2 equivalence point:

pH = 14 – pKb

From the graph:

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Problem Details

Consider the following curve for the titration of a weak base with a strong acid and answer each of the following questions.
The figure shows pH as a function of the volume of acid added. pH is measured from 0 to 14 on the x-axis and volume is measured from 0 to 50 milliliters on the x-axis. The curve starts at pH 12 at 0 milliliters. Then it decreases slowly to pH 10 at 23 milliliters added, then falls to pH 2 at 25 milliliters added. Then the curve decreases slowly again to pH 1 at 50 milliliters.

At what volume of added acid does pH = 14 – pKb?