Calcium sulfate
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| Calcium sulfate | |
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| Missing image Calcium_sulfate_hemihydrate.jpg Calcium sulfate hemihydrate | |
| General | |
| Other names | Plaster of Paris Gypsum Drierite® |
| Molecular formula | CaSO4 |
| Molar mass | 136.14 g/mol (anhydrous) |
| Appearance | white solid see also text |
| CAS number | [7778-18-9] (anhydrous) |
| Properties | |
| Density and phase | 2.3 g/cm3, solid |
| Solubility in water | 0.24 g/100 ml (20 °C) |
| Melting point | 1450°C (anhydrous) |
| Structure | |
| Coordination geometry | ? |
| Crystal structure | ? |
| Thermodynamic data | |
| Standard enthalpy of formation ΔfH°solid | ? kJ/mol |
| Standard molar entropy S°solid | ? J.K–1.mol–1 |
| Safety data | |
| PEL-TWA (OSHA) | 15 mg/m3 |
| RTECS number | WS6920000 |
| Supplementary data page | |
| Structure & properties | n, εr, etc. |
| Thermodynamic data | Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other cations | Magnesium sulfate Strontium sulfate |
| Related drying agents | Calcium chloride Magnesium sulfate |
| Related compounds | Plaster of Paris Gypsum |
| Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Infobox disclaimer and references | |
Calcium sulfate is a common laboratory and industrial chemical. In its anhydrous form, it is sold as a laboratory dessicant and drying agent under the name Drierite®. The hemihydrate is better known as plaster of Paris, while the dihydrate occurs naturally as gypsum.
External links
- International Chemical Satefy Card 1215 (http://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/_icsc12/icsc1215.htm)
- NIOSH Pocket Guide to Chemical Hazards (http://www.cdc.gov/niosh/npg/npgd0095.html)