Given the values of ka and kb below which of the systems


Given the values of Ka and Kb below, which of the systems given would be most suitable to use to construct a buffer of pH 9?

HCOOH, Ka = 1.8 x 10-4

CH3COOH, Ka = 1.8 x 10-5

H3AsO4, Ka1 = 6.0 x 10-3, Ka2 = 1.1 x 10-7, Ka3 = 3 x 10-12

C5H5N, Kb = 1.7 x 10-9

NH3, Kb = 1.8 x 10-5

A. H3AsO4/NaH2AsO4
B. HCOOH/NaHCOO
C. C5H5N/ C5H5NHCl
D. CH3COOH/KCH3COO
E. NH4Cl/NH3

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Chemistry: Given the values of ka and kb below which of the systems
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