Related questions

Question

Which pair of compounds would be the best choice to make a buffer solution with a pH around 5? (a) HF and NaF Ka = 6.9 x 10^-4 (b) C2H5CO2H and C2H5CO2Na Ka = 1.3 x 10^-5 (c) HClO and NaClO Ka = 2.8x 10^-8 (d) NH4Cl and NH3 Ka = 5.6 x 10^-10