Calciumbromid
CaBr2 · Brocal · C13189 · Dibromocalcium · CALCIUM BROMIDE · calciumdibromide · CALCIUM BROMIDE 52% · Calcium bromide，98%
Identifikatoren & physikalische Daten
| CAS No. | 7789-41-5 |
|---|---|
| Summenformel | Br2Ca |
| Durchschnittliche Molmasse | 199,89 g/mol |
| Monoisotopische Masse | 197,79927 g/mol |
| SMILES | [Br-].[Br-].[Ca+2] |
| InChIKey | WGEFECGEFUFIQW-UHFFFAOYSA-L |
| PubChem CID | 24608 |
| Lokaler Name | Calciumbromid |
Chemische & physikalische Eigenschaften
| Polarare Oberfläche (TPSA) | 0 |
|---|---|
| H-Brücken-Donoren | 0 |
| H-Brücken-Akzeptoren | 2 |
| Frei drehbare Bindungen | 0 |
| Schwere Atome | 3 |
| Formalladung | 0 |
| Komplexität | 2,8 |
| Schmelzpunkt | 730°C |
| Siedepunkt | 806-812°C |
| Dichte | 3.353 g/mL at 25 °C (lit.) |
| Dampfdruck | 0Pa at 25℃ |
| Flammpunkt | 806-812°C |
| Löslichkeit | soluble in ethanol, acetoneSoluble in water, methanol, ethanol and acetone. Insoluble in dioxane, chloroform and ether. |
| Aggregatzustand | beads |
| Farbe | White to off-white |
| Wichte | 3.353 |
| Geruch | gran. or rhombic cryst., odorless, sharp saline taste |
| Merck | 14,1654 |
| Stabilität | hygroscopic |
| InChI | 1S/2BrH.Ca/h2*1H/q+2/p-2 |
| InChIKey | WGEFECGEFUFIQW-UHFFFAOYSA-L |
| SMILES | Br[Ca]Br |
| CAS Datenbank | 7789-41-5(CAS DataBase Reference) |
| NIST chemische Informationen | Calcium dibromide(7789-41-5) |
| EPA chemische Informationen | Calcium bromide (CaBr2) (7789-41-5) |
Sicherheit & Vorschriften
| Wassergefährdungsklasse (WGK) | 2 |
|---|---|
| TSCA-Inventar-Status | TSCA listed |
| Zollcode | 2827590000 |
| RTECS-Nr. | EV9328000 |
| R-Sätze (R) | 38-41 |
| Gefahrensymbole | Xi |
| Sicherheitshinweise (S) | 22-24/25-39-26 |
| Lagerklasse | 11 - Combustible Solids |
| Gefahrstoffdaten | 7789-41-5(Hazardous Substances Data) |
| Gefahrenklasse | Eye Dam. 1 |
Anwendungen & Verwendung
Beschreibung
Calcium bromide has the chemical formula CaBr2. It was first prepared by Pfeiffer, Klossmann and Angern in 1924. It is a deliquescent salt that has the form of colorless hexagonal crystals that are soluble in water and absolute alcohol. Its molecular weight is 199.90 g/ mol for the anhydride. When strongly heated in air, calcium bromide will produce CaO (lime) and Br2. It is generally obtained as the dihydrate, CaBr2·2H2O, in the form of a white crystalline powder. A hexahydrate, CaBr2·6H2O, is also known. Anhydrous calcium bromide is obtained by dehydration (250°C, vacuum) of the dihydrate CaBr2·2H2O. On contact with hot surfaces or flames, CaBr2 decomposes forming bromine as a toxic and corrosive fume. It also reacts with strong acids to produce corrosive fumes of bromine. In its solid anhydrous state, it is a white powder. CaBr2 can be found in drilling muds, neuroses medication, freezing mixtures, food preservatives, photography and fire retardants. The anhydride has a melting point of 730°C and a boiling point of 810°C where it decomposes. Its density is 3.41 g/cm3. It is moderately soluble in water at 142 g/100 ml of water.
Verwenden
Made by the action of hydrobromic acid on calcium oxide and crystallization. The white granular crystals are soluble in water. Calcium bromide was used in making collodion emulsions, particularly for dye-sensitized plates.
Herstellung & Synthese
synthetische
CaBr2·2H2O has a melting point of 38°C where it dissolves in its own waters of hydration. Its density is 2.290 g/cm3. It can be prepared by reaction in solution with HBr on the carbonate: CaCO3 (solid)＋HBr (liq)→CaBr2 (liq)＋ CO2 (gas) An improved method for producing calcium bromide has been developed by reacting hydrogen bromide with calcium hydroxide in the presence of water.