Difference between revisions of "Calcium hydride"

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| OtherNames = Calcium(II) hydride<br>Calcium dihydride
 
| OtherNames = Calcium(II) hydride<br>Calcium dihydride
 
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| ImageFile = Calcium hydride CaH2 sample by Ormarion.jpg
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| ImageCaption = CaH<sub>2</sub> granules
 
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| BoilingPtC =  
 
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| BoilingPt_notes = Decomposes
 
| Density = 1.70 g/cm<sup>3</sup>
 
| Density = 1.70 g/cm<sup>3</sup>
 
| Formula = CaH<sub>2</sub>
 
| Formula = CaH<sub>2</sub>
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| SolubleOther = Reacts with alcohols, carboxylic acids<br>Insoluble in common solvents
 
| SolubleOther = Reacts with alcohols, carboxylic acids<br>Insoluble in common solvents
 
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| VaporPressure = ~0 mmHg
 
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| OtherCompounds = [[Lithium hydride]]<br>[[Sodium hydride]]
 
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'''Calcium hydride''' is the chemical compound with the formula '''CaH<sub>2</sub>''', widely used as a drying agent.
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'''Calcium hydride''' is the chemical compound with the formula '''CaH<sub>2</sub>''', widely used as a drying agent, especially in drying solvents.
  
 
==Properties==
 
==Properties==
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==Projects==
 
==Projects==
 
*Dry solvents
 
*Dry solvents
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*Readily hydrogen source
  
 
==Handling==
 
==Handling==
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===Storage===
 
===Storage===
Calcium hydride is best stored in closed  
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Calcium hydride is best stored in closed and airtight containers.
  
 
===Disposal===
 
===Disposal===
Reacting calcium hydride with water vapor in an open area is sufficient.
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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.
  
 
==References==
 
==References==
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[[Category:Hydrogen compounds]]
 
[[Category:Hydrogen compounds]]
 
[[Category:Metal hydrides]]
 
[[Category:Metal hydrides]]
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[[Category:Bases]]
 
[[Category:Insoluble compounds]]
 
[[Category:Insoluble compounds]]
 
[[Category:Reducing agents]]
 
[[Category:Reducing agents]]
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[[Category:Desiccants]]
 
[[Category:Materials unstable in acidic solution]]
 
[[Category:Materials unstable in acidic solution]]
 
[[Category:Materials that react with water]]
 
[[Category:Materials that react with water]]
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[[Category:Irritants]]
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[[Category:Air-sensitive materials]]
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[[Category:Solids]]

Latest revision as of 17:58, 13 January 2024

Calcium hydride
Calcium hydride CaH2 sample by Ormarion.jpg
CaH2 granules
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
41.4 J·mol−1·K−1
−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.

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
  • Readily hydrogen source

Handling

Safety

Calcium hydride reacts with water, releasing flammable hydrogen gas.

Storage

Calcium hydride is best stored in closed and airtight containers.

Disposal

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.

References

Relevant Sciencemadness threads