Answered: Water is the solvent of life, yet it…

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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Question

Water is the solvent of life, yet it only dissociates to a small extent. What is the pKa of water?
A. 0.5
B. 3.5
C. 7.0
D. 10.7
E. 15.7

Expert Solution

Step 1

Since, water behave as a weak electrolyte, in the pure state, water is dissociated to a very small extent into hydrogen and hydroxyl ions. The equilibrium constant of the dissociation is given by---

H₂O <=====> H⁺ + OH^-

Therefore the dissociation constant of water is given by-----

K_a = [H⁺] [OH^-] / [H₂O]

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