Phenolphthalein has a pKa of 9.7. It is colorless in its acid form and pink in its basic form. For pH=2.2, calculate [In−]/[HIn]. For pH= 4.8, calculate [In−]/[HIn]. For pH= 7.7, calculate [In−]/[HIn]. For pH= 11.4, calculate [In−]/[HIn].

Phenolphthalein has a pKa of 9.7. It is colorless in its acid form and pink in its basic form. For pH=2.2, calculate [In−]/[HIn]. For pH= 4.8, calculate [In−]/[HIn]. For pH= 7.7, calculate [In−]/[HIn]. For pH= 11.4, calculate [In−]/[HIn].

Introduction to General, Organic and Biochemistry

11th Edition

ISBN:9781285869759

Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Chapter22: Proteins

Section: Chapter Questions

Problem 22.68P

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Question

Phenolphthalein has a pKa of 9.7. It is colorless in its acid form and pink in its basic form.

For pH=2.2, calculate [In−]/[HIn].

For pH= 4.8, calculate [In−]/[HIn].

For pH= 7.7, calculate [In−]/[HIn].

For pH= 11.4, calculate [In−]/[HIn].

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