Barium cyanide

Structural formula
General
Surname	Barium cyanide
Molecular formula	Ba (CN) 2
Brief description	dissolvable prismatic crystals
External identifiers / databases
CAS number 542-62-1 EC number 208-822-3 ECHA InfoCard 100.008.021 PubChem 10961 Wikidata Q808217
properties
Molar mass	189.36 g · mol -1
Physical state	firmly
solubility	good in water (800 g l −1 at 14 ° C)
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 330-310-300-410 EUH: 032 P: ?
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Barium cyanide is the barium salt of hydrocyanic acid .

Manufacturing

Barium cyanide can be produced by introducing hydrogen cyanide into baryta water .

${\displaystyle \mathrm {Ba(OH)_{2}+2\ HCN\longrightarrow Ba(CN)_{2}\ +2\ H_{2}O} }$

It can also be made by annealing barium hydroxide and charcoal in air or in a stream of nitrogen .

${\displaystyle \mathrm {Ba(OH)_{2}+3\ C+N_{2}\longrightarrow Ba(CN)_{2}\ +H_{2}O+CO} }$

properties

Barium cyanide is a hygroscopic compound and crystallized as the dihydrate Ba (CN) ₂  · 2 H ₂ O in the form of prismatic crystals which it at 100 ° C water of crystallization proposed. When Ba (CN) _{2 is} heated in a stream of steam, barium hydroxide Ba (OH) _{2 is formed} with the expulsion of ammonia NH ₃ and carbon monoxide CO.

${\displaystyle \mathrm {Ba(CN)_{2}+4\ H_{2}O\longrightarrow Ba(OH)_{2}+2\ NH_{3}+2\ CO} }$

Barium carbide is produced by heating with magnesium powder in the absence of air .

Individual evidence

1. ↑ ^{a b c d e} R. Abegg, F. Auerbach: Handbuch der inorganic Chemie. Verlag S. Hirzel, Vol. 2, 1908. P. 258. Full text
2. ^ Dale L. Perry, Sidney L. Phillips: Handbook of inorganic compounds . CRC Press, 1995, ISBN 978-0-8493-8671-8 , p. 49 ( limited preview in Google book search).
3. ↑ Entry on barium cyanide in the GESTIS substance database of the IFA , accessed on September 4, 2016(JavaScript required) .
4. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the indicated labeling it falls under the group entries for barium salts, with the exception of barium sulphate, salts of 1-azo-2-hydroxynaphthalenyl aryl sulphonic acid , and of salts specified elsewhere in this Annex and salts of hydrogen cyanide with the exception of complex cyanides such as ferrocyanides, ferricyanides and mercuric oxycyanide and those specified elsewhere in this Annex in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on 18 March 2017. Manufacturers or distributors can extend the harmonized classification and labeling .
5. ^ Friedrich Konrad Beilstein: Beilstein's handbook of organic chemistry . 1918, Verlag Edward Bros., 4th edition 1943, 1st volume, p. 243. Full text