What reaction occurs when NH4Br dissolves in water?

Question

A. NH4+ + OH- <==> NH4OH

B. Br-+ H3O <==> HBr+ H2O

C. NH3+H2O <==>NH4+OH

D. NH4+H2O <==> NH3+H3O+

E. Br- + H2O <==> HBr+ OH-

Answer 1

NH₄Br is the salt of a weak base, NH₄OH and a strong acid HBr.  Thus, the NH₄⁺ will hydrolyze as follows:

NH₄⁺ + H₂O ==> NH₃ + H₃O⁺ , so D is the correct answer.