Analytical ChemistryHard
Question
White precipitate of Zn(OH)2 dissolves in :
Options
A.sodium hydroxide solution
B.acid solution
C.ammonia solution
D.solution of ammonium salts
Solution
(A) Zn(OH)2 ↓ + 2OH- → [Zn(OH)4]2-
(B) Zn(OH)2 ↓ + 2H+ ⇋ Zn2+ + 2H2O
(C) & (D) White precipitate of Zn(OH)2 dissolves in excess of ammonia solution and in solutions of ammonium salts owing to the production of tetraamminezincate(II).
Zn(OH)2 ↓ + 4NH3 ⇋ [Zn(NH3)4]2+ + 2OH-
(B) Zn(OH)2 ↓ + 2H+ ⇋ Zn2+ + 2H2O
(C) & (D) White precipitate of Zn(OH)2 dissolves in excess of ammonia solution and in solutions of ammonium salts owing to the production of tetraamminezincate(II).
Zn(OH)2 ↓ + 4NH3 ⇋ [Zn(NH3)4]2+ + 2OH-
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