A 135 G Sample of Ammonium Chloride Is Added to Sufficient

A 1.35 g sample of ammonium chloride is added to sufficient water to give 150.0 mL of solution whose pH is less than 7.0. Several dissociation reactions occur. Which of the following goes essentially to completion?

A) H₂O $\rarr$ H⁺ + OH^-
B) NH₄⁺ $\rarr$ NH₃ + H⁺
C) NH₃ $\rarr$ NH₂^- + H⁺
D) NH₄Cl $\rarr$ NH₄⁺ + Cl^-
E) NH₃ + H₂O $\rarr$ OH^- + NH₄⁺