Sodium sulfate
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| Sodium sulfate | |
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| Missing image Sodium_sulfate.jpg Sodium sulfate | |
| General | |
| Systematic name | Sodium sulfate |
| Other names | Sodium sulphate Salt cake |
| Molecular formula | Na2SO4 |
| Hydrates | Heptahydrate (Na2SO4·7H2O) Decahydrate (Na2SO4·10H2O) |
| Molar mass | 142.04 g/mol (anhydrous) 268.14 g/mol (heptahydrate) |
| Appearance | White crystalline solid, hygroscopic |
| CAS number | [7757-82-6] (anhydrous) [7727-73-3] (decahydrate) |
| Properties | |
| Density | 2.68 g/cm3, anhydrous (orthorhombic form) |
| Solubility in water | 4.76 g/100 ml (0 °C) 42.7 g/100 ml (100 °C) |
| In ethanol | insoluble |
| Melting point | 884 °C (1157S K) |
| Structure | |
| Coordination geometry | ? |
| Crystal structure | monoclinic, |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | Irritant |
| R/S statement | None |
| RTECS number | WE 1650000 (anhydrous) |
| Supplementary data page | |
| Structure & properties | n, εr, etc. |
| Thermodynamic data | Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | Sodium hydrogen sulfate |
| Other cations | Lithium sulfate |
| Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Infobox disclaimer and references | |
Sodium sulfate is an important compound of sodium, widely used to make sodium sulfide for the Kroll process of paper pulpling. When anhydrous, it is a white crystalline solid of formula Na2SO4. The decahydrate, Na2SO4•10H2O, is also known as Glauber's salt, after Johann Glauber, who discovered it in the 17th century, or sal mirabilis. The white or colorless crystals were originally used as a laxative. Other uses include dyeing, frosting windows, heat storage in passive solar heating systems, wood digestion in the pulp industry, and detergents. About half of the world's production is from the natural mineral form - found in lake beds in southern Saskatchewan, for example, where it is also known as mirabilite; and half from by-products of chemical processes.
External link
"Sodium sulfate" on Saskatchewan Interactive (http://interactive.usask.ca/ski/mining/search/mineral_types/industrial/ssulphate.html)
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