Identify the cation for the following case:
$NaOH$ the solution, when added to the solution (B), gives white ppt which does not dissolve in excess.

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Solution

Explanation:
Calcium ion $({Ca}^{2 +})$ reacts with Sodium hydroxide $(NaOH)$ gives a white precipitate of Calcium hydroxide $(Ca {(OH)}_{2})$ which does not dissolves in excess amount of Sodium hydroxide solution.
The chemical reaction is as follows.
$\underset{Calcium ion}{{Ca}^{2 +}} + \underset{Sodium hydroxide}{NaOH (s)} \to \underset{Calcium hydroxide}{Ca {(OH)}_{2} (s)}$

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

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