Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 17 - Additional Aspects of Aqueous Equilibria - Exercises - Page 766: 17.4c


Drawing number $(2)$ represents a situation that cannot arise from the addition of either acids or bases.

Work Step by Step

The sum: $[HA] + [A^-]$ has to be constant, because we are not removing anything. The only thing the addition of an acid or base can do, is to reduce the concentrations of one of them, and, in the same proportion, raise the concentration of the other one.
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