Sodium Sulphate
Sodium Sulphate (also known as Sodium Sulphate or Sulphate of Soda) is the inorganic compound as well as related hydrates. All forms are white solids that are highly soluble in water.
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IDENTIFIERS
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Chemical Name: Sodium Sulphate
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Other Names: Sodium Sulphate, Sulphate of Sodium, Thenardite (mineral), Glauber’s Salt (decahydrate), Sal mirabillis (decahydrate), Mirabilite (decahydrate mineral), Disodium Sulphate.
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CAS Number
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7757-82-6
7727-73-3 (decahydrate)
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PROPERTIES
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Chemical Formula
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Na2SO4
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Molar Mass
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142.04 g/mol (anhydrous)
322.20 g/mol (decahydrate)
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Appearance
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White Crystalline Solid, Hygroscopic
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Odor
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Odorless
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Density
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2.664 g/cm3 (anhydrous)
1.464 g/cm3 (decahydrate)
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Solubility in Water
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Anhydrous
4.76 g/100 mL (0 0C)
13.9 g/100 mL (20 0C)
42.7 g/100 mL (100 0C)
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Depthahydrate
19.5 g/100 mL (0 0C)
44 g/100 mL (20 0C)
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Solubility
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Insoluble in ethanol, soluble in glycerol
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Melting Point
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884 0C (anhydrous)
32.38 0C (decahydrate)
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Boiling Point
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1,429 0C (anhydrous)
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APPLICATIONS
Commodity Industries : The largest use is as filler in powdered home laundry detergents, Kraft process for the manufacture of wood pulp and the Glass industry (as fining agent to remove small air bubbles) provides another significant application for Sodium Sulphate.
Food Industry : Used as a diluent for food colours, known as E number additive E514.
Small-scale Applications : Anhydrous Sodium Sulphate is widely used as an inert drying agent in laboratory for removing traces of water from organic solutions.
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