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Chemistry: An Atoms First Approach

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

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BuyFindarrow_forward

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 14, Problem 115CP
Textbook Problem
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The titration of Na2CO3 with HCl bas the following qualitative profile:

Chapter 14, Problem 115CP, The titration of Na2CO3 with HCl bas the following qualitative profile: a. Identify the major

a. Identify the major species in solution at points A–F.

b. Calculate the pH at the halfway points to equivalence, B and D. (Hint: Refer to Exercise 113.)

 (a)

Interpretation Introduction

Interpretation: The titration curve of Na2CO3 and HCl is given. Various questions based on the given curve are to be answered.

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.

Explanation of Solution

Explanation

There is presence of Na+ in all the solutions. There occurs formation of HCO3 after the HCl has reacted with CO32 . This is shown by points A-C. Once all the CO32 has reacted, the proton from acid reacts with the other available base, that is HCO3 . It is shown by the points C-E. The point C is the first equivalence point and point E is the second equivalence point. The species that are shown by different points are given as,

Point A CO32 , Na+ and H2O
Point B CO32 , HCO3 , Na+ , Cl , H2

(b)

Interpretation Introduction

Interpretation: The titration curve of Na2CO3 and HCl is given. Various questions based on the given curve are to be answered.

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 at the halfway points to the equivalence points, B and D.

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Chemistry: An Atoms First Approach
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