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 the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use?
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Answer:
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.
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Answer - M- chlorobenzoic acid ( PKa -3. 98)
p- chlorocinnamic acid ( PKa- 4.41)
2,5-dihydroxy binzoci acid (PKa-2.97)
Acetoacetic acid (PKa- 3.58)
carrect option (S) :D
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