Titrations of Diprotic and Polyprotic Acids Video Lessons

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Problem: When a diprotic acid, H2A, is titrated with NaOH, the protons on the diprotic acid are generally removed one at a time, resulting in a pH curve that has the following generic shape:a. Notice that the plot has essentially two titration curves. If the first equivalence point occurs at 100.0 mL NaOH added, what volume of NaOH added corresponds to the second equivalence point?b. For the following volumes of NaOH added, list the major species present after OH- reacts completely.i. 0 mL NaOH addedii. between 0 and 100 mL of NaOH addediii. 100 mL NaOH addediv. between 100 and 200 mL NaOH addedv. 200 mL NaOH addedvi. after 200 mL NaOH addedc. If the pH at 50.0 mL NaOH added is 4.0, and the pH at 150.0 mL NaOH added of 8.0, determine the Ka1, and Ka2 for the diprotic acid.

FREE Expert Solution

a. Notice that the plot has essentially two titration curves. If the first equivalence point occurs at 100.0 mL NaOH added, what volume of NaOH added corresponds to the second equivalence point?


The equivalence point is located at the center of the high slope part of the curve. 


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Problem Details

When a diprotic acid, H2A, is titrated with NaOH, the protons on the diprotic acid are generally removed one at a time, resulting in a pH curve that has the following generic shape:


a. Notice that the plot has essentially two titration curves. If the first equivalence point occurs at 100.0 mL NaOH added, what volume of NaOH added corresponds to the second equivalence point?

b. For the following volumes of NaOH added, list the major species present after OH- reacts completely.

i. 0 mL NaOH added

ii. between 0 and 100 mL of NaOH added

iii. 100 mL NaOH added

iv. between 100 and 200 mL NaOH added

v. 200 mL NaOH added

vi. after 200 mL NaOH added

c. If the pH at 50.0 mL NaOH added is 4.0, and the pH at 150.0 mL NaOH added of 8.0, determine the Ka1, and Ka2 for the diprotic acid.

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