Nessler’s reagent K2 (Hg I4 ) Potassium Mercuric Iodide

Potassium Mercuric Iodide used as Nessler's reagen Cas 7783-33-7 , a 0.09 mol/L solution of potassium tetraiodomercurate(II) (K2[HgI4]) in 2.5 mol/L potassium hydroxide, used to detect ammonia.