Beryllium hydroxide
| 200px | |
| Names | |
|---|---|
| IUPAC name
Beryllium hydroxide
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| Other names
Hydrated beryllia
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| Identifiers | |
13327-32-7  |
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| ChEBI | CHEBI:35102  |
| ChemSpider | 24727701 |
| EC Number | 236-368-6 |
| 1024 | |
| Jmol 3D model | Interactive image |
| MeSH | Beryllium+hydroxide |
| PubChem | 25879 |
| RTECS number | DS3150000 |
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| Properties | |
| BeH2O2 | |
| Molar mass | 43.03 g·mol−1 |
| Appearance | Vivid white, opaque crystals |
| Density | 1.92 g cm−3[1] |
| Melting point | 1,000 °C (1,830 °F; 1,270 K) (decomposes) |
| slightly soluble | |
| Structure | |
| Linear | |
| Thermochemistry | |
| 1.443 J K−1 | |
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Std molar
entropy (S |
47 J·mol−1·K−1[2] |
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Std enthalpy of
formation (ΔfH |
-904 kJ mol−1[3] |
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Gibbs free energy (ΔfG˚)
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-818 kJ/mol |
| Vapor pressure | {{{value}}} |
| Related compounds | |
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Related compounds
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Aluminium oxide |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 verify (what is ?) |
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| Infobox references | |
Beryllium hydroxide, Be(OH)2, is an amphoteric hydroxide, dissolving in both acids and alkalis. Industrially, it is produced as a by-product in the extraction of beryllium metal from the ores beryl and bertrandite.[4] When alkali is added to beryllium salt solutions the α-form (a gel) is formed. If this left to stand or boiled, the rhombic β-form precipitates.[5] This has the same structure as zinc hydroxide, Zn(OH)2, with tetrahedral beryllium centers.[6]
Reactions
With alkalis it dissolves to form the tetrahydroxidoberyllate(2-) anion.[7] With sodium hydroxide solution:
- 2NaOH(aq) + Be(OH)2(s) → Na2Be(OH)4(aq)
With acids, beryllium salts are formed.[7] For example, with sulfuric acid, H2SO4, beryllium sulfate is formed:
- Be(OH)2 + H2SO4 → BeSO4 + 2H2O
Beryllium hydroxide dehydrates at 400 °C to form the soluble white powder, beryllium oxide:[7]
- Be(OH)2 → BeO + H2O
Further heating at higher temperature produces acid insoluble BeO.[7]
References
- ↑ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Jessica Elzea Kogel, Nikhil C. Trivedi, James M. Barker and Stanley T. Krukowski, 2006, Industrial Minerals & Rocks: Commodities, Markets, and Uses, 7th edition, SME, ISBN 0-87335-233-5
- ↑ Mary Eagleson, 1994, Concise encyclopedia chemistry, Walter de Gruyter, ISBN 3-11-011451-8
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 7.2 7.3 Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5
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