Calcium hydride

Calcium hydride
Names
IUPAC name
Calcium hydride
Other names
Calcium(II) hydride
Calcium dihydride
Hydrolith
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.263
EC Number
  • 232-189-2
UNII
  • InChI=1S/Ca.2H/q+2;2*-1 Y
    Key: UUGAXJGDKREHIO-UHFFFAOYSA-N Y
  • InChI=1/Ca.2H/q+2;2*-1
    Key: UUGAXJGDKREHIO-UHFFFAOYAG
  • [H-].[H-].[Ca+2]
Properties
CaH2
Molar mass 42.094 g/mol
Appearance gray powder (white when pure)
Density 1.70 g/cm3, solid
Melting point 816 °C (1,501 °F; 1,089 K)
reacts violently
Solubility reacts in alcohol
Structure
Orthorhombic, oP12
Pnma, No. 62
Thermochemistry
41.4 J/(mol·K)
−181.5 kJ/mol
−142.5 kJ/mol
Hazards
GHS labelling:
Danger
H260
NFPA 704 (fire diamond)
3
3
2
W
Related compounds
Other cations
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

Calcium hydride is the chemical compound with the formula CaH2, an alkaline earth hydride. This grey powder (white if pure, which is rare) reacts vigorously with water, liberating hydrogen gas. CaH2 is thus used as a drying agent, i.e. a desiccant.

CaH2 is a saline hydride, meaning that its structure is salt-like. The alkali metals and the alkaline earth metals heavier than beryllium all form saline hydrides. A well-known example is sodium hydride, which crystallizes in the NaCl motif. These species are insoluble in all solvents with which they do not react. CaH2 crystallizes in the PbCl2 (cotunnite) structure.

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