| 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|
| Lithium hydride|
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
A simple way of neutralizing calcium hydride is to add it slowly in a large volume of water, in a well ventilated area. A slower, but safer way is to expose calcium hydride to water vapors. Instead of water, long chain alcohols can also be used to neutralize this compound.