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Chemistry for Today: General, Orga...

9th Edition
Spencer L. Seager + 2 others
Publisher: Cengage Learning
ISBN: 9781305960060

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BuyFindarrow_forward

Chemistry for Today: General, Orga...

9th Edition
Spencer L. Seager + 2 others
Publisher: Cengage Learning
ISBN: 9781305960060
Chapter 9, Problem 9.128E
Textbook Problem
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Imagine that a solution of weak acid is being titrated with a strong base. Describe the substances present in the solution being titrated when it has been titrated halfway to the equivalence point. How is the pH of this half-titrated solution related to the p K a for the weak acid?

Interpretation Introduction

Interpretation:

The substances present in the solution being titrated when it has been titrated halfway to the equivalence point have to be stated. The relation of pH of the half-titrated solution to the pKa for the weak acid is to be stated.

Concept introduction:

pH of a solution is the value of negative logarithm of the concentration of hydrogen ions in a solution. An acidic solution has a pH below 7, a basic solution has a pH more than 7 and a neutral solution has a pH equal to 7. The point in a titration where chemically equivalent quantities of the acid and the base have been mixed together is known as the equivalence point of the titration.

Explanation of Solution

The equivalence point is that point in a titration when chemically equivalent quantities of both the acid and the base have been reacted. It is given that a solution of weak acid is being titrated with a strong base. At the point halfway to the equivalence point of the titration, the species present include conjugate acid of the strong base, conjugate base of the weak acid and the weak acid. The relation of pH of the half-titrated solution to the pKa for the weak acid is given by the equation,

pH=pKa+log([H+][B

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Chapter 9 Solutions

Chemistry for Today: General, Organic, and Biochemistry
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