Английская Википедия:Beryllium hydroxide
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.[1] The natural pure beryllium hydroxide is rare (in form of the mineral behoite, orthorhombic) or very rare (clinobehoite, monoclinic).[2][3] 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.[4] This has the same structure as zinc hydroxide, Zn(OH)2, with tetrahedral beryllium centers.[5]
Reactions
Beryllium hydroxide is difficult to dissolve in water. With alkalis it dissolves to form the tetrahydroxoberyllate (also known as tetrahydroxidoberyllate) anion, [Be(OH)4]2−.[6] With sodium hydroxide solution:
- 2 NaOH(aq) + Be(OH)2(s) → Na2[Be(OH)4](aq)
With acids, beryllium salts are formed.[6] For example, with sulfuric acid, H2SO4, beryllium sulfate is formed:
- Be(OH)2 + H2SO4 → BeSO4 + 2 H2O
Beryllium hydroxide dehydrates at 400 °C to form the soluble white powder, beryllium oxide:[6]
- Be(OH)2 → BeO + H2O
Further heating at higher temperature produces acid insoluble BeO.[6]
References
Шаблон:Beryllium compounds Шаблон:Hydroxides
- ↑ Jessica Elzea Kogel, Nikhil C. Trivedi, James M. Barker and Stanley T. Krukowski, 2006, Industrial Minerals & Rocks: Commodities, Markets, and Uses, 7th edition, SME, Шаблон:ISBN
- ↑ Mindat, http://www.mindat.org/min-603.html
- ↑ Mindat, http://www.mindat.org/min-1066.html
- ↑ Mary Eagleson, 1994, Concise encyclopedia chemistry, Walter de Gruyter, Шаблон:ISBN
- ↑ Шаблон:Greenwood&Earnshaw2nd
- ↑ 6,0 6,1 6,2 6,3 Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier Шаблон:ISBN
