Identifying the major species in weak acid or weak base equilibrium

Question

For each solution, write the chemical formulas of the major species present at equilibrium. You can leave out water itself. Keep in mind that NH₃ is a weak base. 

1.0 mol of HCl is added to 1.0 L of 1.0 M NH₃ solution.

Acids: ?

Bases: ?

Other: ?

0.26 mol of NaOH is added to 1.0 L of a solution that is 1.1 M in both NH₃ and NH₄Br.

Acids: ?

Bases: ?

Other: ?

Answer 1

A bit complicated but... 1 mol base + 1 mol acid --> 1mol salt, in this case NH4Cl, or NH4+ Major species the ion NH4+. Minor species derive from equilibrium NH4+ <--> H+ + NH3, which leans to the right: NH3, H+.