Which of the following pairs would be the best buffer at pH 10.0?
A) Acetic acid and sodium acetate (pKa = 4.76)
B) H2CO3 and NaHCO3 (pKa values are 3.77 and 10.4)
C) Lactic acid and sodium lactate (pKa = 3.86)
D) NaH2PO4 and Na2HPO4 (pKa values are 2.1, 7.2, 12.4)
E) Sodium succinate and succinic acid (pKa = 4.21)
Correct Answer:
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