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Which of the following acids (and their sodium salts) would be the best choice to make a buffer at pH 4.30? e. Chloroacetic acid (K = 1.35 x 10-³) f. Propanoic acid ( K 1.3 × 10 ) g. Benzoic acid (K₁ = 6.4 × 105) h. Hypochlorous acid (K = 3.5 x 10-³) (Hint: Optimal buffering system will have a pK value close to the desired pH) =

Which of the following acids (and their sodium salts) would be the best choice to make a buffer at pH 4.30? e. Chloroacetic acid (K = 1.35 x 10-³) f. Propanoic acid ( K 1.3 × 10 ) g. Benzoic acid (K₁ = 6.4 × 105) h. Hypochlorous acid (K = 3.5 x 10-³) (Hint: Optimal buffering system will have a pK value close to the desired pH) =

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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3 Which of the following acids (and their sodium salts) would be the best choice to make a buffer at pH 4.30? e. Chloroacetic acid (K = 1.35 x 103³) f. Propanoic acid ( K₂ = 1.3 x 10³) g. Benzoic acid (K₁ = 6.4 × 10³) a h. Hypochlorous acid (K = 3.5 × 10-8) (Hint: Optimal buffering system will have a pK, value close to the desired pH)
Transcribed Image Text:3 Which of the following acids (and their sodium salts) would be the best choice to make a buffer at pH 4.30? e. Chloroacetic acid (K = 1.35 x 103³) f. Propanoic acid ( K₂ = 1.3 x 10³) g. Benzoic acid (K₁ = 6.4 × 10³) a h. Hypochlorous acid (K = 3.5 × 10-8) (Hint: Optimal buffering system will have a pK, value close to the desired pH)
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Step 1: Given

Given:

e. Chloroacetic acid (straight K subscript straight a equals 1.35 cross times 10 to the power of negative 3 end exponent)

f. Propanoic acid (straight K subscript straight a equals 1.3 cross times 10 to the power of negative 5 end exponent)

g. Benzoic acid (straight K subscript straight a equals 6.4 cross times 10 to the power of negative 5 end exponent)

 h. Hypochlorous acid (straight K subscript straight a equals 3.5 cross times 10 to the power of negative 8 end exponent)

The acid dissociation constant, or straight K subscript straight a is a measurement of how much an acid ionizes in a solution. It is defined as the ratio of the concentration of dissociated ions to the concentration of the undissociated acid.

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