Consider a solution consisting of the following two buffer systems:
H2CO3 ⇌ HCO3 - + H + pKa = 6.4
H2PO4 - ⇌ HPO4-2 + H + pKa = 7.2
At pH 6.4, which one of the following is TRUE of the relative amounts of acid and conjugate base present?
A) [H2CO3] = [HCO3 - ] and [H2PO4 - ] > [HPO4 -2 ]
B) [H2CO3] > [HCO3 - ] and [H2PO4 - ] > [HPO4 -2 ]
C) [H2CO3] = [HCO3 - ] and [HPO4 -2 ] > [H2PO4 - ]
D) [HCO3 - ] > [H2CO3] and [HPO4 -2 ] > [H2PO4 - ]
E) [H2CO3] > [HCO3 - ] and [HPO4 -2] > [H2PO4 -]
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