What combination of substances will give a buffered solution that has a pH of 5.05? Assume each pair of substances is dissolved in 5.0 L of water. (Kb for NH3 = 1.8 *10-5; Kb for C5H5N = 1.7 * 10-9)
A) 1.0 mol C5H5N and 1.5 mol C5H5NHCl
B) 1.0 mol NH3 and 1.5 mol NH4Cl
C) 1.5 mol NH3 and 1.0 mol NH4Cl
D) 1.5 mol C5H5N and 1.0 mol C5H5NHCl
E) none of these
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