Calcium hydride

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Calcium hydride
Names
IUPAC name
Calcium hydride
Other names
Calcium(II) hydride
Calcium dihydride
Identifiers
Jmol-3D images Image
Properties
CaH2
Molar mass 42.094 g/mol
Appearance White (pure) or gray (impure) powder
Density 1.70 g/cm3
Melting point 816 °C (1,501 °F; 1,089 K)
Reacts
Solubility Reacts with alcohols, carboxylic acids
Insoluble in common solvents
Thermochemistry
41.4 J·mol−1·K−1
−181.5 kJ·mol−1
Hazards
Safety data sheet ApolloScientific
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Calcium hydride is the chemical compound with the formula CaH2, widely used as a drying agent, especially in drying solvents.

Properties

Chemical

Calcium hydride reacts with water to release hydrogen gas:

CaH2 + H2O → Ca(OH)2 + H2

Physical

Calcium hydride is a grey or white solid powder, insoluble in all solvents. It reacts vigorously with water and alcohols. CaH2 has a density of 1.70 g/cm3.

Availability

CaH2 is sold by various chemical suppliers.

Preparation

Calcium hydride can be made by reacting dry hydrogen gas with calcium metal at temperatures between 300 to 400 °C.

Projects

  • Dry solvents

Handling

Safety

Calcium hydride reacts with water, releasing flammable hydrogen gas.

Storage

Calcium hydride is best stored in closed

Disposal

Reacting calcium hydride with water vapor in an open area is sufficient. Long chain alcohols can also be used.

References

Relevant Sciencemadness threads