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A physician wishes to prepare a buffer solution at pH = 3.58 t

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

m-chlorobenzoic acid

(p K_{a} = 3.98)

p-chlorocinnamic acid

(p K_{a} = 4.41)

2,5-dihydroxy benzoic acid

(p K_{a} = 2.97)

Acetoacetic acid

(p K_{a} = 3.58)

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

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Text solutionVerified

By the use of Henderson's equation

p H = p K_{a} + lo g_{10} . \frac{[ salt ]}{[ acid ]}

When, [salt] = [acid]

∴ p H = p K_{a}

∵ p K_{a} = 3.58

, thus at this state

p H = 3.58

So, acetoacetic acid

(p K_{a} = 3.58)

is best to use.

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Question Text	A physician wishes to prepare a buffer solution at pH = 3.58 that efficiently resist changes in pH yet contains only small concentration of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use ?
Answer Type	Text solution:1
Upvotes	150

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

Text solutionVerified

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