Environmental Science for AP* (2nd Edition)

Published by W. H. Freeman
ISBN 10: 1464108684
ISBN 13: 978-1-46410-868-6

Chapter 15 - AP Environmental Science Practice Exam - Section 1: Multiple-Choice Questions - Page 549: 9

Answer

(c)

Work Step by Step

Under natural conditions, the pH of rainfall is closest to $5.6$ due to the presence of naturally occurring carbon dioxide in the atmosphere. Carbon dioxide reacts with water in the atmosphere, forming carbonic acid, which lowers the pH of rainwater. The answer is (c).
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