   # Calculate the pH after 0.020 mole of NaOH is added to 1.00 L of each of the four solutions in Exercise 21. ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 14, Problem 27E
Textbook Problem
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## Calculate the pH after 0.020 mole of NaOH is added to 1.00 L of each of the four solutions in Exercise 21.

(a)

Interpretation Introduction

Interpretation:

The pH value after 0.020mole of NaOH is added to 1.00L of each of the given four solutions in Exercise 21 is to be calculated.

Concept introduction:

The pH of a solution is defined as a figure that expresses the acidity of the alkalinity of a given solution.

The pOH of a solution is calculated by the formula, pOH=log[OH]

The sum, pH+pOH=14

To determine: The pH

### Explanation of Solution

Explanation

The dominant equilibrium reaction that takes place in the given case is,

HC3H5O2(aq)+NaOH(aq)NaC3H5O2(aq)+H2O(l)

Since, 0.020mole of NaOH have been added,

HC3H5O2+NaOHNaC3H5O2Beforereaction1.00L×0.100M=0.1mol1.00L×0.020M=0.02mol0Afterreaction0.10.02=0.08mol0.020.02=00.02

The relation between pH and pKa is given by Henderson-Hasselbach equation

(b)

Interpretation Introduction

Interpretation:

The pH value after 0.020mole of NaOH is added to 1.00L of each of the given four solutions in Exercise 21 is to be calculated.

Concept introduction:

The pH of a solution is defined as a figure that expresses the acidity of the alkalinity of a given solution.

The pOH of a solution is calculated by the formula, pOH=log[OH]

The sum, pH+pOH=14

To determine: The pH

(c)

Interpretation Introduction

Interpretation:

The pH value after 0.020mole of NaOH is added to 1.00L of each of the given four solutions in Exercise 21 is to be calculated.

Concept introduction:

The pH of a solution is defined as a figure that expresses the acidity of the alkalinity of a given solution.

The pOH of a solution is calculated by the formula, pOH=log[OH]

The sum, pH+pOH=14

To determine: The pH

(d)

Interpretation Introduction

Interpretation:

The pH value after 0.020mole of NaOH is added to 1.00L of each of the given four solutions in Exercise 21 is to be calculated.

Concept introduction:

The pH of a solution is defined as a figure that expresses the acidity of the alkalinity of a given solution.

The pOH of a solution is calculated by the formula, pOH=log[OH]

The sum, pH+pOH=14

To determine: The pH

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