Chemistry: Molecular Approach (4th Edition)

Published by Pearson
ISBN 10: 0134112830
ISBN 13: 978-0-13411-283-1

Chapter 16 - Section 16.5 - Autoionization of Water and pH - Conceptual Connection - Page 736: 16.4


(b) The acidity decreases.

Work Step by Step

As we can see in figure 16.8, the pH represents more acidic solutions with small values, and basic solutions with values greater than 7.0. The acidity of a solution is proportional to its $H_3O^+$ concentration. The mathematical definition of pH is: $$pH = -log[H_3O^+]$$ Since there is a negative sign in the logarithimic expression, $[H_3O^+]$ is inversely proportional to the pH. Therefore, the pH is inversely proportional to $[H_3O^+]$, which is proportional to the acidity, making the pH inversely proportional to the acidity.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.