a.Both acids can be used  to buffer a solution at pH 4.0. b.The conjugate base of citric acid can be used as buffer at pH 8 c.Oxalic acid is a weaker acid than citric acid; d.The conjugate base of citric acid is more basic than the conjugate base of oxalic acid.

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Chapter9: Acids, Bases, And Salts
Section: Chapter Questions
Problem 9.121E
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Given the following: citric acid pKa1 = 3.12, oxalic acid pKa1=1.25. Which of the following is true?

a.Both acids can be used  to buffer a solution at pH 4.0.
b.The conjugate base of citric acid can be used as buffer at pH 8
c.Oxalic acid is a weaker acid than citric acid;
d.The conjugate base of citric acid is more basic than the conjugate base of oxalic acid. 
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