Question

When a solution is treated with excess dilute HCl, the white precipitate contains cations of:

• A. $P{b}^{2+}$
• B. $H{g}^{2+}$
• C. $A{g}^{+}$
• D. All of the above

Answer 1

The correct option is D All of the above

When a solution is treated with excess dilute HCl, a white precipitate may contain $P{b}^{2+},H{g}^{2+}$ or $A{g}^{+}$.
Filter and wash the precipitate and then add $N{H}_3$ solution to the precipitate.
If the precipitate:
Does not change: $P{b}^{2+}$ present
Turns black: $H{g}_2^{2+}$ present
Dissolves: $A{g}^{+}$ present