| IUPAC name
| Other names
|Molar mass||42.094 g/mol|
|Appearance||White (pure) or gray (impure) powder|
|Melting point||816 °C (1,501 °F; 1,089 K)|
|Solubility|| Reacts with alcohols, carboxylic acids|
Insoluble in common solvents
|Vapor pressure||~0 mmHg|
Std enthalpy of
|Safety data sheet||ApolloScientific|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Calcium hydride is the chemical compound with the formula CaH2, widely used as a drying agent, especially in drying solvents.
Calcium hydride reacts with water to release hydrogen gas:
- CaH2 + H2O → Ca(OH)2 + H2 ↑
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.
CaH2 is sold by various chemical suppliers.
Calcium hydride can be made by reacting dry hydrogen gas with calcium metal at temperatures between 300 to 400 °C.
- Dry solvents
Calcium hydride reacts with water, releasing flammable hydrogen gas.
Calcium hydride is best stored in closed
Reacting calcium hydride with water vapor in an open area is sufficient. Long chain alcohols can also be used.