Mercury(Ii) Iodide

Mercury(II) iodide is a chemical compound with the formula HgI2. It is also known as mercuric iodide. It is a bright red or orange powder that is insoluble in water and alcohol but soluble in organic solvents.

Mercury(II) iodide can be prepared by reacting mercury with iodine, or by mixing solutions of potassium iodide and mercuric chloride. It has a high melting point of 342°C and can sublimate at higher temperatures without melting.

Mercury(II) iodide is used in various applications such as in the manufacture of some types of thermometers, in the production of red pigment for paints, and as an X-ray and gamma ray detector. It is also used in some photochromic lenses and in some pyrotechnics. However, due to its toxicity, it should be handled with care and proper safety precautions must be taken during its use and disposal.