Analytical ChemistryHard
Question
An aqueous solution contains both Al3+ & Zn2+.To this solution NH4OH is added in excess.
Options
A.Only Al(OH)3 will be precipitated.
B.Only Zn(OH)2 will be precipitated.
C.Both will be precipitated.
D.No precipitate will appear.
Solution
In excess of NH4OH, precipitate of Zn(OH)2 gets dissolved.
Zn(OH)2 + 4NH3 ⇋ [Zn(NH3)4]2+ + 2OH-.
Zn(OH)2 + 4NH3 ⇋ [Zn(NH3)4]2+ + 2OH-.
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