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

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.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Acid and Base Titration Curves concept. You can view video lessons to learn Acid and Base Titration Curves. Or if you need more Acid and Base Titration Curves practice, you can also practice Acid and Base Titration Curves practice problems.

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Based on our data, we think this problem is relevant for Professor Cleveland's class at UCO.