What is the pH of a solution prepared by mixing 50.0 mL of 0.10 M methylamine, CH3NH2, with 20.00 mL of 0.10 M methylammonium chloride, CH3NH3Cl? Assume that the volume of the solutions are additive and that Kb= 3.70 x 10^-4 for methylamine. A) 10.17 B) 10.57 C) 10.97 D) 11.78