Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 15 - Additional Aqueous Equilibria - Questions for Review and Thought - Topical Questions - Page 693b: 46


A rain with pH equal to 6.7 is not considered "acid rain", because due to the presence of $CO_2$ in the atmosphere, the unpolluted rain has, naturally, a pH that is slightly acidic (About 5.6).

Work Step by Step

These are the reactions: $CO_2 + H_2O \lt -- \gt H_2CO_3 + H_2O \lt -- \gt H_3O^+ + HCO{_3}^- $ - Since we have a natural reaction that produces $H_3O^+$, this rain is not considered "acid rain".
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