Identify the substance underlined, in each of the following cases:
Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide.

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Solution

Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide is $Z n^{2 +}$ .
$Z n^{2 +} + 2 N a O H \to Z n (O H)_{2} ↓ white ppt + 2 N a^{+}$
$Z n^{2 +} + 2 N H_{3} + 2 H_{2} O \to Z n (O H)_{2} ↓ + 2 N H_{4}^{+}$
$Z n (O H)_{2} ↓ + 4 N H_{3} \to [Z n (N H_{3})_{4}]^{2 +} + 2 O H^{-}$

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Identify the substance underlined, in each of the following cases:Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide.

Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide is Zn2+.Zn2++2NaOH→Zn(OH)2↓ white ppt+2Na+Zn2++2NH3+2H2O→Zn(OH)2↓+2NH+4Zn(OH)2↓+4NH3→[Zn(NH3)4]2++2OH−

Identify the substance underlined, in each of the following cases:
Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide.