Mercury(II) thiocyanate

• Quecksilberthiocyanat
• Quecksilberrhodanid

White, odorless, flammable solid

Fixed

3.71 g · cm -3

165 ° C ( decomposition)

Poorly in water ( 0.7 g · l-1 at 25 ° C)

Risk

0.1 mg · m-3

46 mg · kg -1 ( LD50, rat, oral)

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Mercury (II) thiocyanate, is a chemical compound of the mercury which is present in the form of a white odorless powder.

Production and representation

Mercury (II) thiocyanate, may be represented by the reaction of ammonium thiocyanate with mercuric chloride.

It can also be obtained by reaction of mercury (II ) nitrate with potassium thiocyanate.

Properties

Mercury (II ) thiocyanate is a white, odorless, flammable solid, which is poorly soluble in water. It exists as a colorless, radiating needles or pearlescent flakes. It is soluble in alcohol, as well as potassium thiocyanate solution, but slightly soluble in ether. When heated to 165 ° C., a decomposition with the swelling. Mercury (II ) thiocyanate has a monoclinic crystal structure (a = 10.88 Å, b = 4.050 Å, c = 6.446 Å, ß = 95.35 °).

Use

Mercury (II ) thiocyanate is used:

• A detection means for chloride ions ( color reaction with iron ( III) nitrate to mercury ( II) chloride and iron ( III) - thiocyanate).
• In photography in the development of reinforcing negative
• There used to be a joke article ( Pharaoh snakes ) was used ( forms when lighting black elongated foamy structure ), but this is ruled out today due to the toxicity of the mercury vapors.