   # Consider the titration of 100.0 mL of 0.200 M acetic acid ( K a = 1.8 × 10 −5 ) by 0.100 M KOH. Calculate the pH of the resulting solution after the following volumes of KOH have been added. a. 0.0 mL b. 50.0 mL c. 100.0 mL d. 150.0 mL e. 200.0 mL f. 250.0 mL ### 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 59E
Textbook Problem
320 views

## Consider the titration of 100.0 mL of 0.200 M acetic acid (Ka = 1.8 × 10−5) by 0.100 M KOH. Calculate the pH of the resulting solution after the following volumes of KOH have been added.a. 0.0 mLb. 50.0 mLc. 100.0 mLd. 150.0 mLe. 200.0 mLf. 250.0 mL

(a)

Interpretation Introduction

Interpretation: The titration of Acetic acid with different volumes of KOH is given. The pH of each solution is to be calculated.

Concept introduction: Titration is a quantitative chemical analysis method that is used for the determination of concentration of an unknown solution. In acid base titration, the neutralization of either acid or base is done with a base or acid respectively of known concentration. This helps to determine the unknown concentration of acid or base.

When the amount of the titrant added is just sufficient for the neutralization of analyte is called equivalence point. At this point equal equivalents of both the acid and base are added.

To determine: The value of pH of solution when 0.0mL KOH has been added to it.

### Explanation of Solution

Explanation

The concentration of H+ .is 0.00189M_ .

Given:

The concentration of Acetic acid is 0.200M .

The concentration of KOH is 0.100M .

The volume of Acetic acid is 100.0mL .

The volume of KOH is 0.0mL .

The value of Ka of Acetic acid is 1.8×105

The conversion of mL into L is done as,

1mL=0.001L

Hence the conversion of 100mL into L is done as,

100mL=100×0.001L=0.100L

The concentration of any species is given as,

Concentration=NumberofmolesVolumeofsolutioninlitres (1)

Rearrange the above equation to obtain the value of number of moles.

Numberofmoles=Concentration×Volumeofsolutioninlitres (2)

Substitute the concentration and volume of CH3COOH in the above equation as,

Numberofmoles=Concentration×Volumeofsolutioninlitres=0.200M×0.1L=0.02moles

Make the ICE table for the reaction between CH3COOH and KOH .

CH3COOH+KOHCH3COOK++H2OInitial moles:0.0200Change:00+0.02Finalmoles:0.0200.02

The above equation shows the presence of equilibrium condition in the solution.

Make the ICE table for the dissociation reaction of CH3COOH .

CH3COOHCH3COOH+Initial(M):0.200Change(M):xxxEquilibrium(M):0

(b)

Interpretation Introduction

Interpretation: The titration of Acetic acid with different volumes of KOH is given. The pH of each solution is to be calculated.

Concept introduction: Titration is a quantitative chemical analysis method that is used for the determination of concentration of an unknown solution. In acid base titration, the neutralization of either acid or base is done with a base or acid respectively of known concentration. This helps to determine the unknown concentration of acid or base.

When the amount of the titrant added is just sufficient for the neutralization of analyte is called equivalence point. At this point equal equivalents of both the acid and base are added.

To determine: The value of pH of solution when 50.0mL KOH has been added to it.

(c)

Interpretation Introduction

Interpretation: The titration of Acetic acid with different volumes of KOH is given. The pH of each solution is to be calculated.

Concept introduction: Titration is a quantitative chemical analysis method that is used for the determination of concentration of an unknown solution. In acid base titration, the neutralization of either acid or base is done with a base or acid respectively of known concentration. This helps to determine the unknown concentration of acid or base.

When the amount of the titrant added is just sufficient for the neutralization of analyte is called equivalence point. At this point equal equivalents of both the acid and base are added.

To determine: The value of pH of solution when 100.0mL KOH has been added to it.

(d)

Interpretation Introduction

Interpretation: The titration of Acetic acid with different volumes of KOH is given. The pH of each solution is to be calculated.

Concept introduction: Titration is a quantitative chemical analysis method that is used for the determination of concentration of an unknown solution. In acid base titration, the neutralization of either acid or base is done with a base or acid respectively of known concentration. This helps to determine the unknown concentration of acid or base.

When the amount of the titrant added is just sufficient for the neutralization of analyte is called equivalence point. At this point equal equivalents of both the acid and base are added.

To determine: The value of pH of solution when 150.0mL KOH has been added to it.

(e)

Interpretation Introduction

Interpretation: The titration of Acetic acid with different volumes of KOH is given. The pH of each solution is to be calculated.

Concept introduction: Titration is a quantitative chemical analysis method that is used for the determination of concentration of an unknown solution. In acid base titration, the neutralization of either acid or base is done with a base or acid respectively of known concentration. This helps to determine the unknown concentration of acid or base.

When the amount of the titrant added is just sufficient for the neutralization of analyte is called equivalence point. At this point equal equivalents of both the acid and base are added.

To determine: The value of pH of solution when 200.0mL KOH has been added to it.

(f)

Interpretation Introduction

Interpretation: The titration of Acetic acid with different volumes of KOH is given. The pH of each solution is to be calculated.

Concept introduction: Titration is a quantitative chemical analysis method that is used for the determination of concentration of an unknown solution. In acid base titration, the neutralization of either acid or base is done with a base or acid respectively of known concentration. This helps to determine the unknown concentration of acid or base.

When the amount of the titrant added is just sufficient for the neutralization of analyte is called equivalence point. At this point equal equivalents of both the acid and base are added.

To determine: The value of pH of solution when 250.0mL KOH has been added to it.

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