Identify the cation for the following:
${NH}_{4} OH$ when added to the solution (B) gives white ppt which does not dissolve in excess.

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Solution

Explanation:
${Pb}^{2 +}$ reacts with Ammonium hydroxide ( ${NH}_{4} OH$ ) gives a gelatinous white precipitate of Lead hydroxide ( $Pb {(OH)}_{2}$ ).
The chemical reaction is as follows.
$\underset{Lead ion}{{Pb}^{2 +}} + \underset{Ammonium hydroxide}{{NH}_{4} OH (l)} \to \underset{Lead hydroxide}{Pb {(OH)}_{2} (s)}$ ⇣

Thus, the cation is identified as ${Pb}^{2 +}$ .

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