Microbiology: An Introduction, 11th Edition

Published by Benjamin Cummings
ISBN 10: 0321733606
ISBN 13: 978-0-32173-360-3

Chapter 2 - Figure 2.7 - The pH scale - Question - Page 35: 1

Answer

The concentrations of H+ and OH- are equal at pH of 7.

Work Step by Step

Acidic solutions contain more H+ than OH- and have a pH lower than 7. If a solution has more OH- than H+ , it is a basic, or alkaline, solution. In pure water, a small percentage of the molecules are dissociated into H+ and OH-, so it has a pH of 7. Because the concentrations of H+ and OH- are equal, this pH is said to be the pH of a neutral solution.
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