The addition of ammonia has wide effect on the aqueous solution, depending on the
amount of ammonia into the solution, different zinc hydroxide complex like Zn(OH)+, Zn(OH)2, Zn(OH)-
3,
Zn(OH)2-
4 will be appeared.
Studies on the molar ratio of zinc ion and hydroxide ion showed that, as the amount of
ammonia in solution increases, the amount of hydroxide ion (OH-) increase, when molar ration between these ions
was 1:2 (Zn2+ : OH-) Zn(OH)2 fabricated, With most adding ammonia in solution for increasing in the amount of
hydroxide ions, Zn(OH)-
3, Zn(OH)2-
4 ions will be fabricated. According to reaction equation, reaction between water
and ammonia create hydroxide ions and then these ions reaction with zinc cation ions and make zinc hydroxide
complex