.) Identify the substance underlined in each of the
following cases.
(1) A solution of the compound is used as an
electrolyte when copper is purified.
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1
Answer:
Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide is Zn
2+
.
Zn
2+
+2NaOH→
white ppt
Zn(OH)
2
↓
+2Na
+
Zn
2+
+2NH
3
+2H
2
O→Zn(OH)
2
↓+2NH
4
+
Zn(OH)
2
↓+4NH
3
→[Zn(NH
3
)
4
]
2+
+2OH
−
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