A) A solution that is 6.5x10^-2 M in potassium propionate (C2H5COOK or KC3H5O2) and 9.0x10^-2 M in propionic acid (C2H5COOH or HC3H5O2)
B) A solution that is 8.0x10^-2 M in trimethylamine, (CH3)3N, and 0.10 M in trimethylammonium chloride, (CH3)3NHCl
C) A solution that is made by mixing 50.0 mL of 0.16 M acetic acid and 50.0 mL of 0.20 M sodium acetate