# A solution is 0.18 M KOH. What are the concentrations of H 3 O + and OH − in this solution?

### General Chemistry - Standalone boo...

11th Edition
Steven D. Gammon + 7 others
Publisher: Cengage Learning
ISBN: 9781305580343

### General Chemistry - Standalone boo...

11th Edition
Steven D. Gammon + 7 others
Publisher: Cengage Learning
ISBN: 9781305580343

#### Solutions

Chapter
Section
Chapter 15, Problem 15.93QP
Textbook Problem

## A solution is 0.18 M KOH. What are the concentrations of H3O+ and OH− in this solution?

Expert Solution
Interpretation Introduction

Interpretation:

The concentration of hydronium and hydroxide ion has to be determined.

Concept introduction:

pH is an logarithmic expression to express a solution is acidic, basic or neutral.  pH scale lies values between 1-14 and on which 7 is neutral, below 7 values are more acidic in nature and above 7 values are more basic in nature.

Use the following formula to determine the concentration of hydroxide ion and hydronium ion of the given solution.

[H3O+]= Kw÷[OH-]

The Kw value for a base is 1.0 ×10-14

### Explanation of Solution

The given concentration is 0.18 M

We know that, KOH is a strong base and it contains only one hydroxide ion and is equal to the given concentration.

Therefore, the hydroxide ion concentration is 0.18 M

Now, let’s determine the hydronium ion concentration by using the above formula by plugging the values as follows.

[H3O+]= Kw÷[OH-]

[H3O+]1

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