Difference between revisions of "Calcium hydride"
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[[Category:Hydrogen compounds]] | [[Category:Hydrogen compounds]] | ||
[[Category:Metal hydrides]] | [[Category:Metal hydrides]] | ||
| + | [[Category:Bases]] | ||
[[Category:Insoluble compounds]] | [[Category:Insoluble compounds]] | ||
[[Category:Reducing agents]] | [[Category:Reducing agents]] | ||
Revision as of 22:21, 14 August 2017
| 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) |
| Boiling point | Decomposes |
| Reacts | |
| Solubility | Reacts with alcohols, carboxylic acids Insoluble in common solvents |
| Vapor pressure | ~0 mmHg |
| Thermochemistry | |
| Std molar
entropy (S |
41.4 J·mol−1·K−1 |
| Std enthalpy of
formation (ΔfH |
−181.5 kJ·mol−1 |
| Hazards | |
| Safety data sheet | ApolloScientific |
| Related compounds | |
| Related compounds
|
Lithium hydride Sodium hydride |
| 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.
Contents
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
Categories:
- Chemical pages without CAS Registry Number
- Articles without EBI source
- Chemical pages without ChemSpiderID
- Chemical pages without DrugBank identifier
- Articles without KEGG source
- Articles without InChI source
- Articles without UNII source
- Articles containing unverified chemical infoboxes
- Chembox articles without image
- Chemical compounds
- Inorganic compounds
- Calcium compounds
- Hydrogen compounds
- Metal hydrides
- Bases
- Insoluble compounds
- Reducing agents
- Desiccants
- Materials unstable in acidic solution
- Materials that react with water
- Irritants
- Air-sensitive materials
