Equal Volumes of the Following Pairs of Solutions Are Mixed

Multiple Choice

Equal volumes of the following pairs of solutions are mixed. Which pair will produce a buffer solution?

A) 0.10 mol L^-1 HCl and 0.05 mol L^-1 NaOH
B) 0.10 mol L^-1 HCl and 0.15 mol L^-1 NH₃
C) 0.10 mol L^-1 HCl and 0.05 mol L^-1 NH₃
D) 0.10 mol L^-1 HCl and 0.20 mol L^-1 CH₃COOH
E) 0.10 mol L^-1 HCl and 0.20 mol L^-1 NaCl