what is the pH of a solution of 010 M CH3NH2 METHYLAMINE to

what is the pH of a solution of 0.10 M CH3NH2 (METHYLAMINE) to which a salt solution of 0.15 M CH3NH3Cl (methylammonium chloride) has been added?

Solution

methylamine, CH3NH2, 3.36.

poH = pkb +log(base/salt)

= 3.36+ log(0.1/0.15 )

=3.36-0.17

pOH = 3.183

pH = 10.81