Calcium sulfate

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Calcium sulfate
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
ΔfHsolid
 ? kJ/mol
Standard molar entropy
Ssolid
 ? J.K1.mol1
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


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