| Identification | Back Directory | [Name]
BERYLLIUM HYDROXIDE | [CAS]
13327-32-7 | [Synonyms]
Be(OH)2
Chebi:35102
berylliumhydrate
Dihydroxyberyllium
BERYLLIUM HYDROXIDE
Beryllium dihydoxide
berylliumdihydroxide
Beryllium(2+) hydroxide
Beryllium(ii) hydroxide
berylliumhydroxide(be(oh)2)
Beryllium hydroxide (Be(OH)2)
BERYLLIUM HYDROXIDE ISO 9001：2015 REACH | [EINECS(EC#)]
236-368-6 | [Molecular Formula]
BeH2O2 | [MDL Number]
MFCD00049856 | [MOL File]
13327-32-7.mol | [Molecular Weight]
43.03 |
| Chemical Properties | Back Directory | [Appearance]
White powder. Decomposes to the oxide
at 138C. Soluble in acids and alkalies; insoluble in
water.
| [Melting point ]
105 °C (decomp) | [density ]
1.92 | [solubility ]
slightly soluble in H2O, alkaline solutions; soluble in acid solutions | [form ]
amorphous powder or crystals | [color ]
Colorless, orthorhombic, amorphous powder orcrystals | [PH]
7.9(1 mM solution);7.9(10 mM solution);7.9(100 mM solution) | [Water Solubility ]
very slightly soluble H2O, dilute alkali; soluble hot NaOH, acids [MER06] | [EPA Substance Registry System]
Beryllium hydroxide (Be(OH)2) (13327-32-7) |
| Hazard Information | Back Directory | [Chemical Properties]
White powder. Decomposes to the oxide
at 138C. Soluble in acids and alkalies; insoluble in
water.
| [Uses]
manufacture of beryllium and beryllium oxide. | [Hazard]
Very toxic. | [Physical properties]
Beryllium Hydroxide can be prepared by reacting
the oxide with water:
BeO＋H2O→Be(OH)2
If heated, it decomposes at
1273°C. Its solubility in water is slight and its solubility
product Ksp(H2O) is 6.92×10-22. It is soluble in acids and
bases.
Beryllium hydroxide exists in three forms: as a metastable
tetragonal crystalline solid (a-Be(OH)2; as a stable
orthorhombic crystalline solid (b-Be(OH)2); and in
a slightly basic pH, it appears as a slimy, gelatinous
substance (Be(OH)42-). | [Definition]
beryllium hydroxide: A whitecrystalline compound, Be(OH)2, precipitatedfrom solutions of berylliumsalts by adding alkali. Like the oxide,it is amphoteric and dissolves in excessalkali to give beryllates. | [Preparation]
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”
When alkali is added to beryllium salt solutions, the
a-form (a gel) is formed. If this left to stand or boiled
the rhombic b-form precipitates. This has the Zn(OH)2
structure with tetrahedral beryllium centers. The alkali
dissolution forms a “beryllate”:
2NaOH(aq)＋Be(OH)2(solid) → Na2Be(OH)4(aq)
With acids, beryllium salts are formed involving the
Be(OH)＋ cation. With sulfuric acid, H2SO4:
2Be(OH)2＋H2SO4→[Be(OH)]2SO4＋ 2H2O
Thus, the probable formula for beryllium hydroxide
is Be(OH)OH. However, this has never been reported.
Beryllium hydroxide dehydrates completely at 400°C to form a white powder of acid soluble beryllium oxide:
Be(OH)2＋ heat → BeO＋H2O
Further heating at higher temperature produces acid
insoluble BeO. | [Safety Profile]
Confirmed carcinogen withexperimental carcinogenic and tumorigenic data. Poisonby intravenous route. When heated to decomposition it emitsvery toxic fumes of BeO. |
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