Cobalt Cyanide (II)

Cobalt cyanide
Cobalt cyanide
Are common
Systematic ; name	Cobalt Cyanide (II)
Traditional names	cobalt cyanide
Chem. formula	Co (CN) 2
Physical properties
condition	blue violet crystals
Molar mass	110.97 g / mol
Density	1,872 g / cm³
Classification
Reg. CAS number	542-84-7
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Cobalt (II) cyanide is an inorganic compound, a salt of cobalt metal and hydrocyanic acid with the formula Co (CN) ₂ , blue-violet crystals, does not dissolve in water, forms crystalline hydrates .

Content

Getting

Heating of cobalt (II) chloride with potassium cyanide ( iron catalyst):

{\mathsf {CoCl_{2}+2KCN\ {\xrightarrow {T,Fe}}\ Co(CN)_{2}+2KCl}}

{\ displaystyle {\ mathsf {CoCl_ {2} + 2KCN \ {\ xrightarrow {T, Fe}} \ Co (CN) _ {2} + 2KCl}}}

The effect of potassium cyanide on excess cobalt (II) salt solution:

{\mathsf {Co(NO_{3})_{2}+2KCN\ {\xrightarrow {}}\ Co(CN)_{2}\cdot 3H_{2}O\downarrow +2KNO_{3}}}

{\ displaystyle {\ mathsf {Co (NO_ {3}) _ {2} + 2KCN \ {\ xrightarrow {}} \ Co (CN) _ {2} \ cdot 3H_ {2} O \ downarrow + 2KNO_ {3} }}}

Physical Properties

Cobalt (II) cyanide forms blue-violet hygroscopic crystals.

Forms crystalline hydrates of the composition Co (CN) ₂ • n H ₂ O, where n = 2, 3.

Not soluble in water.

Chemical Properties

Crystalline hydrate decomposes stepwise by heating:

{\mathsf {Co(CN)_{2}\cdot 3H_{2}O\ {\xrightarrow[{-H_{2}O}]{100^{o}C}}\ Co(CN)_{2}\cdot 2H_{2}O\ {\xrightarrow[{-H_{2}O}]{250^{o}C}}\ Co(CN)_{2}}}

{\ displaystyle {\ mathsf {Co (CN) _ {2} \ cdot 3H_ {2} O \ {\ xrightarrow [{- H_ {2} O}] {100 ^ {o} C}} \ Co (CN) _ {2} \ cdot 2H_ {2} O \ {\ xrightarrow [{- H_ {2} O}] {250 ^ {o} C}} \ Co (CN) _ {2}}}}

It is dissolved in an excess of cyanides :

{\mathsf {Co(CN)_{2}+4KCN\ {\xrightarrow {}}\ K_{4}[Co(CN)_{6}]}}

{\ displaystyle {\ mathsf {Co (CN) _ {2} + 4KCN \ {\ xrightarrow {}} \ K_ {4} [Co (CN) _ {6}]}}}

Toxicity

Cobalt cyanide, like all cyanides, is extremely toxic.

Literature

Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1990. - T. 2. - 671 p. - ISBN 5-82270-035-5 .
Chemistry Handbook / Editorial: Nikolsky B.P. et al. - 3rd ed., rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.
Ripan R., Chetyanu I. Inorganic chemistry. Chemistry of metals. - M .: Mir, 1972. - T. 2. - 871 p.

Cobalt cyanide
Are common
Systematic name	Cobalt Cyanide (II)
Traditional names	cobalt cyanide
Chem. formula	Co (CN) ₂
Physical properties
condition	blue violet crystals
Molar mass	110.97 g / mol
Density	1,872 g / cm³
Classification
Reg. CAS number	542-84-7
PubChem
Reg. EINECS number
Smiles
Inchi
ChemSpider
Security
Toxicity	0 four 0