Berylliumhydroxid

Bezeichnung:Berylliumhydroxid

CAS-Nr13327-32-7

Englisch Name:BERYLLIUM HYDROXIDE

CBNumberCB9449796

SummenformelBeH2O2

Molgewicht43.03

MOL-Datei13327-32-7.mol

Synonyma

Berylliumhydroxid

Berylliumhydroxid physikalisch-chemischer Eigenschaften

Schmelzpunkt	105 °C (decomp)
Dichte	1.92
Löslichkeit	slightly soluble in H2O, alkaline solutions; soluble in acid solutions
Aggregatzustand	amorphous powder or crystals
Farbe	Colorless, orthorhombic, amorphous powder orcrystals
PH	7.9(1 mM solution);7.9(10 mM solution);7.9(100 mM solution)
Wasserlöslichkeit	very slightly soluble H2O, dilute alkali; soluble hot NaOH, acids [MER06]
EPA chemische Informationen	Beryllium hydroxide (Be(OH)2) (13327-32-7)

Sicherheit

RIDADR	1566
HazardClass	6.1(a)
PackingGroup	II
Giftige Stoffe Daten	13327-32-7(Hazardous Substances Data)
Toxizität	LDLo ivn-rat: 3821 mg/kg XEURAQ UR-70,1949

BERYLLIUM HYDROXIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

Chemische Eigenschaften
White powder. Decomposes to the oxide at 138C. Soluble in acids and alkalies; insoluble in water.
Physikalische Eigenschaften
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)4^2-).
Verwenden
Beryllium hydroxide is a strategic component concerning the usage of beryllium metal and its compounds in industry. Beryllium hydroxide is the key compound used to prepare a variety of beryllium products.Note that Be(OH)2 is the primary product used to prepare the metal and various beryllium salts.
The largest usage of beryllium hydroxide is to make the oxide or the metal that is used in many industries. The total tonnage is not large but substantial. Beryllium hydroxide is available commercially in large quantities.
Verwenden
manufacture of beryllium and beryllium oxide.
synthetische
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.
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.
Hazard
Very toxic.
Sicherheitsprofil
Confirmed carcinogen withexperimental carcinogenic and tumorigenic data. Poisonby intravenous route. When heated to decomposition it emitsvery toxic fumes of BeO.

Berylliumhydroxid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

13327-32-7, BERYLLIUM HYDROXIDE Verwandte Suche:

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