Which of the Following Pairs Would Be the Best Buffer

question 27

Multiple Choice

Which of the following pairs would be the best buffer at pH 10.0?

• A)acetic acid and sodium acetate (pK_a = 4.76)
• B)H₂CO3 and NaHCO₃ (pKas are 3.77 and 10.4)
• C)lactic acid and sodium lactate (pK_a = 3.86)
• D)NaH₂PO4 and Na2HPO4 (pK_as are 2.1,7.2,12.4)

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