65mL of a 0.2M solution of the tetrapeptide Arg-His-Ile-Glu is adjusted to pH=7.8. Thesolution is then titrated with 65mL of a 0.5M solution of HCl. Sketch the titration curve,labelling the pH and volume axes. Indicate clearly the volume of HCl needed to reach eachrelevant pKa value and equivalence point for the titration given.(Relevant pKa values are 2.2, 4.3, 6.0, 9.6 and 12.5)

Here, we are titrating a tetrapeptide Arg-His-Ile-Glu against HCl.

Answered: 65mL of a 0.2M solution of the…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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0.250 M of NaOH is used to carry out the titration of a weak diprotuce solid. It is used until the second equivalence point has been surpassed. The equivalence points are easily seen at 12mL and 24 ml, but the mass of the unknown solid was never documented. Using pKa values, the identity of the unknown is presumed to be ascorbic acid. How many grams of ascorbic acid was there to begin with? (For reference, ascorbic acid's molar mass is 176.12 g mol, the pKa1 is 4.10, and the pKa2 is 11.79)
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