A chemist needs a solution buffered at pH 4.30 and can choose from the following acids: A. Chloroacetic acid (Ka = 1.35 x 10-3) B. Propanoic acid (Ka = 1.30 x 10-5) C. Benzoic acid (Ka = 6.40 x 10-5) D. Hypochlorous acid (Ka = 3.50 x 10-8) Which of the following will be best suited to make the buffer? Show calculations to support your answer.

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PROBLEM 1
A chemist needs a solution buffered at pH 4.30
and can choose from the following acids:
A. Chloroacetic acid (Ka = 1.35 x 103)
B. Propanoic acid (Ka = 1.30 x 10-5)
C. Benzoic acid (Ka = 6.40 x 10-5)
D. Hypochlorous acid (Ka = 3.50 x 10-8)
Which of the following will be best suited to
make the buffer? Show calculations to support
your answer.
Transcribed Image Text:PROBLEM 1 A chemist needs a solution buffered at pH 4.30 and can choose from the following acids: A. Chloroacetic acid (Ka = 1.35 x 103) B. Propanoic acid (Ka = 1.30 x 10-5) C. Benzoic acid (Ka = 6.40 x 10-5) D. Hypochlorous acid (Ka = 3.50 x 10-8) Which of the following will be best suited to make the buffer? Show calculations to support your answer.
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