9th Edition
Steven S. Zumdahl
ISBN: 9781133611097




9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

You make 1.00 L of a buffered solution (pH = 4.00) by mixing acetic acid and sodium acetate. You have 1.00 M solutions of each component of the buffered solution. What volume of each solution do you mix to make such a buffered solution?

Interpretation Introduction


The volume of each of the given solutions that is acetic acid and sodium acetate, required to make a buffered solution is to be calculated.

Concept introduction:

A solution that resists a change in the pH on addition of an acid or an alkali is termed as a buffer solution.



To find the value of pKa

The given value of Ka is 1.8×105 .

The value of pKa is calculated by the formula,


Substitute the value of Ka in the above expression.


To find the ratio [Salt][Acid] at pH 4.00

The relation between pH and pKa is given by Henderson-Hasselbach equation. According to this equation,


The calculated value of pKa is 4.74 .

Substitute the value of pKa and the given value of pH in the Henderson-Hasselbach equation.


To find the volume of sodium acetate and that of the acetic acid required

The concentration is calculated by the formula,


The number of moles is calculated by the formula,


The volume of sodium acetate is assumed to be V1 and its initial molarity is assumed to be M1

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