Problem: A weak unknown monoprotic acid is titrated with a strong base. The titration curve is shown below.Find Ka for the unknown acid.

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FREE Expert Solution

At half-equivalence point:  pH = pK


pKa=-logKaKa=10-pKa

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Problem Details

A weak unknown monoprotic acid is titrated with a strong base. The titration curve is shown below.

A graph of pH versus Volume of base added (mL). At 0 mL of base the pH starts out at about 3 then steadily increases as base is added. At about 25 mL of base added the graph is almost vertical from a pH of about 6 to 11. As more base is added past 25 mL the pH goes back to a steady increase up to 50 mL where the pH is about 12.

Find Ka for the unknown acid.