# If pond water has a pH of 5, the hydroxide concentration would be: a. 10 -5 M . b. 10 -10 M . c. 10 5 M . d. 10 9 M . e. 10 -9 M .

### Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892

### Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892

#### Solutions

Chapter
Section
Chapter 2, Problem 9TYK
Textbook Problem
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## If pond water has a pH of 5, the hydroxide concentration would be:a. 10-5M.b. 10-10M.c. 105M.d. 109M.e. 10-9M.

Expert Solution
Summary Introduction

Introduction:

Water is a polar solvent, which is composed of H+ and OH in equal concentrations and is considered neutral. Water causes dissociation of most substances that are present in it. These substances are classified as acidic, basic and neutral depending on their ability to change the concentration of H+ and OH in water.

### Explanation of Solution

Option (e) is 10-9M. The hydroxide concentration of the pond water, which has a pH 5 (potential of hydrogen) is calculated in the following steps:

As pH is equal to 5, then the H+ is 10-5.

As per Kw,

[H+][OH] = 1014105[OH] = 1014[OH]=101410</

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