Nessler's reagent is used to detect

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(C) Nessler's reagent,$K_2[HgI_4]$,is used for the detection and quantitative determination of ammonia (or $NH_4^+$) in solution.It reacts with ammoni

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$NH_4^+$

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(C) Nessler's reagent,$K_2[HgI_4]$,is used for the detection and quantitative determination of ammonia (or $NH_4^+$) in solution.It reacts with ammonia to form a brown precipitate of $Hg_2NI \cdot H_2O$ (often represented as $IHg-NH_2-Hg-O-I$ or similar structures),known as the iodide of Millon's base.The reaction is: $NH_4^+ + 2[HgI_4]^{2-} + 4OH^- \rightarrow Hg_2NI \cdot H_2O + 7I^- + 3H_2O$.

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