Cadmium cyanide

Cadmium (II ) cyanide

White powder or lozenges

Fixed

2.226 g · cm -3

200 ° C ( decomposition)

0.13 mbar ( 484 ° C)

• Slightly soluble in water ( 17.1 g · l-1 at 15 ° C )
• Soluble in KCN solution

Risk

16 mg · kg -1 ( LD50, rat, oral)

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Cadmium cyanide is a chemical compound of cadmium from the group of cyanides.

Production and representation

Cadmium cyanide can be obtained by solution of cadmium hydroxide in aqueous hydrogen cyanide and subsequent evaporation.

It can be precipitated from an aqueous solution also a cadmium salt (eg cadmium sulfate) with an alkali metal cyanide (eg potassium cyanide ).

Properties

Cadmium cyanide is a non-flammable, moisture sensitive white powder which, when heated turns brown and decomposes at temperatures above 200 ° C, hydrogen cyanide is released. In water it slowly decomposes. Cadmium cyanide has a cubic crystal structure of the copper ( I) oxide - type (a = 6.32 Å). It is slightly soluble in water but soluble whereby K2Cd (CN) 4 forms in potassium cyanide.

Use

Cadmium cyanide is for plating ( ie as corrosion protection) uses of metals.