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12255-53-7

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12255-53-7 Structure

12255-53-7 Structure
IdentificationBack Directory
[Name]

Calcium Arsenide
[CAS]

12255-53-7
[Synonyms]

CALCIUM ARSENIDE
tricalcium diarsenide
[EINECS(EC#)]

235-509-9
[Molecular Formula]

AsCaH2
[MDL Number]

MFCD00799696
[MOL File]

12255-53-7.mol
[Molecular Weight]

117.02
Chemical PropertiesBack Directory
[EPA Substance Registry System]

Calcium arsenide (Ca3As2) (12255-53-7)
Safety DataBack Directory
[Symbol(GHS) ]


GHS07
[Signal word ]

Warning
[Hazard statements ]

H315-H319
[Precautionary statements ]

P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313
Hazard InformationBack Directory
[Description]

Calcium arsenide has the molecular formula of Ca3As2 and the molecular weight of 270.0772 g/mol. It may be prepared by reacting the elements together.
Since As sublimes at 614°C and Ca melts at 839°C, the latter is melted at about 875°C in an inert atmosphere like argon (not N2 which would form nitrides) and arsenic vapors are carried into the reaction zone by a stream of Ar gas:
3Ca + 2As + heat ? Ca3As2
Its CAS number is 12255-53-7. The standard Gibbs energies of formation of Ca3As2 was determined by a chemical equilibration technique yielding the following results:
3Ca + 2As ? Ca3As2 (solid)
△G°= -723,800 + 172.8T (J/mol)
(T = 1273 to 1573 K)
Calcium arsenide has the zinc-blende (cubic) structure with a = 6.751 ? . It can also be prepared by the reduction of calcium arsenate by carbon:
2Ca3AsO4 + 5C + heat ? Ca3As2 + 2CaO + 3CO2
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