Chemistry: Principles and Practice (3rd Edition)

Published by Cengage Learning
ISBN 10: 0534420125
ISBN 13: 978-0-53442-012-3

Chapter 15 - Solutions of Acids and Bases - Questions and Exercises - Questions - Page 672: 15.5


- pH is the negative logarithm of the hydronium concentration: $pH = -log(H_3O^+)$ - The pH is used as a concentration measure because it is easier to represent, if compared to the concentration in $mol/L$ (M).

Work Step by Step

The pH is, most of the time, represented by a number between 0 and 14, and the concentration of $H_3O^+$ in mol/L is represented by a number between $1$ and $10^{-14}$. So, for example, a solution with a $[H_3O^+] \approx 5.0 \times 10^{-4}M$, can be represented by the pH scale with $pH \approx 3.3 $, which is, clearly, easier to write and represent.
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.