nessler's reagent

In analytical chemistry Nessler's reagent is a reagent used to detect small concentrations of ammonia. A yellow coloration indicates the presence of ammonia. At high concentrations, a brown precipitate may form.

Toxicity

It is toxic if swallowed, inhaled or absorbed through the skin. It presents neurological hazard and may act as a carcinogen and be a reproductive hazard. It is corrosive and causes burns. Always wear safety glasses and gloves and manipulate in a well ventilated environment.

Molecular formula

K₂HgI₄ (a solution of mercury (II) iodide, typically around 1.4%, in aqueous potassium iodide and potassium hydroxide.)

Other names

Nessler's solution, mercuric potassium iodide, mercury (II) potassium iodide, Channing's solution, potassium mercuric iodide, potassium tetraiodomercurate (II)

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