Interpretation Introduction To determine: Grams of CH 3 COONa and milliliters of glacial acetic acid that must be used to make the required buffer solution. Explanation Given The pH of the required buffer solution is 4.50 . The concentration of acetic acid in the buffer is 0.15 M . Glacial acetic acid is 99 % CH 3 COOH by mass. Density of glacial acetic acid is 1.05 g/mL . Volume of buffer solution to be prepared is 750 mL . From Appendix D Acid dissociation constant, K a of acetic acid is 1.8 × 10 − 5 . The p K a of acetic acid is calculated by the formula, p K a = − log K a Substitute the value of K a in the above formula. p K a = − log ( 1.8 × 10 − 5 ) = 4.74 The concentration of CH 3 COONa in the buffer solution is calculated by the formula, pH = p K a + log [ CH 3 COONa ] [ CH 3 COOH ] Where, [ CH 3 COONa ] is the concentration of sodium acetate in the buffer solution. [ CH 3 COOH ] is the concentration of acetic acid in the buffer solution. Substitute the values of pH , p K a and [ CH 3 COOH ] in the above formula. 4.50 = 4.74 + log [ CH 3 COONa ] 0.15 [ CH 3 COONa ] 0.15 = 10 ( − 0.24 ) [ CH 3 COONa ] = 0.086 M Conversion of 1 mL into L is done as, 1 mL = 10 − 3 L Therefore, conversion of 750 mL into L is, 750 mL = 750 × 10 − 3 L = 0.75 L Moles of CH 3 COONa is calculated by the formula, n 1 = [ CH 3 COONa ] × V Where, n 1 is the moles of CH 3 COONa in the buffer. V is the volume of buffer. Substitute the values of [ CH 3 COONa ] and V in the above formula. n 1 = 0.086 M × 0.75 L = 0.0645 mol Molar mass of sodium acetate ( CH 3 COONa ) is, 2 × 12.01 g/mol + 3 × 1

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ISBN: 9781269712538

Author: Brown

Publisher: PEARSON

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

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Chapter 3, Problem 70E

Interpretation Introduction

To determine: Grams of CH3COONa and milliliters of glacial acetic acid that must be used to make the required buffer solution.

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Chapter 3, Problem 69E

Chapter 3, Problem 71E

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MASTERING CHEMISTRY:THE CENTRAL SCIENCE

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