Problem: The graph below shows the titration curves for two monoprotic acids.Estimate the pKa of the weak acid.

FREE Expert Solution

We are asked to estimate the pKa of the weak acid from the titration curve. 

A titration curve is a graphical representation of the pH of a solution during a titration

The figure below shows the titration of two monoprotic acids A and B.


A line graph has milliliters NaOH on the X-axis and pH on the Y-axis.  Curve A starts at a higher pH, increases quicker, and has a smaller increase at the equivalence point.


The equivalence point is the point in the titration curve where the amount of titrant added is enough to completely neutralize the analyte solution.

 The half-equivalence point is the point at which the pH of the solution is equal to the dissociation constant (pKa) of the acid. This point is halfway between the equivalence point and the origin.

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Problem Details

The graph below shows the titration curves for two monoprotic acids.

A line graph has milliliters NaOH on the X-axis and pH on the Y-axis.  Curve A starts at a higher pH, increases quicker, and has a smaller increase at the equivalence point.

Estimate the pKa of the weak 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.

What professor is this problem relevant for?

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