A physician wishes to prepare a buffer solution at $p H = 3.58$ that efficiently resists a change in pH yet contains only small concentration of buffering agents. Which one of the following weak acids together with its sodium salt would be best to use?

m-chlorobensoic acid (

p K_{a} = 3.98

)

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p-chlorobenzoic acid (

p K_{a} = 4.41

)

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2,5-dihydroxybenzoic acid (

p K_{a} = 2.97

)

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Acetoacetic acid (

p K_{a} = 3.58

)

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Solution

The correct option is C 2,5-dihydroxybenzoic acid ( $p K_{a} = 2.97$ )

2,5-dihydroxybenzoic acid (pKa=2.97) is the best weak acid which has less pH than the desired buffer solution,so 2,5-dihydroxybenzoic acid do not change the pH of resulting solution.
Hence option C is correct.

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Similar questions

A physician wishes to prepare a buffer solution at pH = 4.41 that efficiently resist change in pH yet contains only small concentration of the buffering agents. Which one of the following weak acid together with its sodium salt should be best to use?

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P^{K a}

Q. Which of the following represents the correct relation for an acidic buffer at

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Q. The

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A physician wishes to prepare a buffer solution at pH=3.58 that efficiently resists a change in pH yet contains only small concentration of buffering agents. Which one of the following weak acids together with its sodium salt would be best to use?

The correct option is C 2,5-dihydroxybenzoic acid (pKa=2.97) 2,5-dihydroxybenzoic acid (pKa=2.97) is the best weak acid which has less pH than the desired buffer solution,so 2,5-dihydroxybenzoic acid do not change the pH of resulting solution.Hence option C is correct.

A physician wishes to prepare a buffer solution at $p H = 3.58$ that efficiently resists a change in pH yet contains only small concentration of buffering agents. Which one of the following weak acids together with its sodium salt would be best to use?

The correct option is C 2,5-dihydroxybenzoic acid ( $p K_{a} = 2.97$ )

2,5-dihydroxybenzoic acid (pKa=2.97) is the best weak acid which has less pH than the desired buffer solution,so 2,5-dihydroxybenzoic acid do not change the pH of resulting solution.
Hence option C is correct.