Among the following pairs of conjugate acidbase which one, Chemistry

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Among the following pairs of conjugate acidbase which one

Among the following pairs of conjugate acid/base, which one is the best choice (with mole ratio nearest to 1) to make a buffer at pH 6.6? The Ka values for the following acids are:
HC2H3O2 1.8 x 10-5
H2PO4- 6.3 x 10-8
H2CO3 4.5 x 10-7
HSO4- 1.2 x 10-2

KH2PO4 /H3PO4

HC2H3O2 /NaC2H3O2

KHCO3 /H2CO3

NH4Cl /NH3

HSO4- /SO42-

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