Mercury(II) iodide
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| Mercury(II) iodide | |
|---|---|
| Other names | mercuric iodide mercury biniodide |
| Identifiers | |
| CAS number | |
| Properties | |
| Molecular formula | HgI2 |
| Molar mass | 454.40 g/mol |
| Appearance | scarlet red powder |
| Density | 6.36 g/cm³, solid |
| Melting point |
259°C |
| Boiling point |
350°C (sublimes) |
| Solubility in water | 6mg/100g water |
| Hazards | |
| NFPA 704 |
|
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | |
Mercury(II) iodide (HgI2) is a chemical compound with an appearance of red-orange crystals. Unlike mercury(II) chloride it is hardly soluble in water (<100 ppm).
Conditions/substances to avoid include: heat, light, bromides, chlorides, ammonia, alkalis, cyanides, copper salts, lead salts, iodoform and hydrogen peroxide.
Mercury(II) iodide displays thermochromism; when heated above 126 °C, it undergoes phase transition from the alpha crystalline form to a pale yellow beta form. As the sample cools, it gradually reacquires its original color. It is often used for thermochromism demonstrations. [1]
Mercury(II) iodide is used for preparation of Nessler's reagent, used for detection of presence of ammonia.
Mercury(II) iodide is a semiconductor material, used in some x-ray and gamma ray detection and imaging devices operating at room temperatures. [2]
In medicine, mercury(II) iodide was formerly used as a treatment for syphilis.
In veterinary medicine, mercury(II) iodide is used in blister ointments in exostoses, bursal enlargement, etc.
Mercury(II) iodide is one of the stated possibilities for the "red mercury".
See also
References
Template:Inorganic-compound-stub
de:Quecksilber(II)-iodid it:Ioduro mercurico
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
