Product Name
Sodium sulfate
Category
Metal & Ceramic Materials
Description
Sodium sulfate is the inorganic compound with formula Na2SO4 as well as several related hydrates. All forms are White solids that are highly soluble in water. With an annual production of 6 million tonnes, the decahydrate is a major commodity chemical product. It is mainly used for the manufacture of detergents and in the Kraft process of paper pulping.
IUPAC Name
Disodium;sulfate
Canonical SMILES
[O-]S(=O)(=O)[O-].[Na+].[Na+]
InChI
InChI=1S/2Na.H₂O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q2*+1;/p-2
InChI Key
PMZURENOXWZQFD-UHFFFAOYSA-L
Density
2.68 g/mL at 25 °C (lit.)
Solubility
Soluble in glycerin, insoluble in alcohol
Storage
Store at +5 °C to +30 °C
Color/Form
Powder or orthorhombic bipyramidal crystals;White orthorhombic crystals or powder
Corrosivity
The rates of corrosion of iron and steel in water are a function of the specific mineral quality as well as the alkalinity and pH values. Sodium sulfate ... is a strong contributor to the rate of corrosion. For example, in water with 400 mg/l of alkalinity (as CaCO3) at pH 7, the corrosion rate will be zero at 200 mg/l of Na2SO4, but when the concentration of sodium sulfate is 400 mg/l, the corrosion rate will be about 100 mg per square cm per day.
Covalently-Bonded Unit Count
3
Decomposition
When heated to decomposition it emits toxic fumes of sulfur oxides and sodium oxide.
EC Number
231-820-9;268-366-6;268-773-9;270-211-2
Monoisotopic Mass
141.93126821
Other Experimental
Transition point to anhydrous form is 24.4 °C; white, rhombic or tetragonal; 19.5 g/100 cc water at 0 °C, 44 g/100 cc water at 20 °C/Sodium sulfate heptahydrate/;Density: 1.46; loses all its water at 100 °C; efflorescent crystals or granules; odorless; aqueous solution is neutral; pH 6 to 7.5; soluble in 1.5 parts water at 25 °C, in 3.3 parts water at 15 °C (solubility in water decreased by sodium chloride); soluble in glycerol; insoluble in alcohol /Sodium sulfate decahydrate/;Transparent, monoclinic crystals; mp: 32.38 °C; index of refraction: 1.394, 1.396, 1.398 /Sodium sulfate decahydrate/;Objectionable taste /Sodium sulfate decahydrate/;4.76 g/100 cc water at 0 °C, 42.7 g/100 cc water at 100 °C; soluble in glycerol; insoluble in alcohol; index of refraction: 1.484, 1.477, 1.471 /Natural thenardite/;Latent heat of fusion: 24.4 kJ at melting point;Heat of formation: -1385 Kj/mole;Entropy: 149.6 J/(mole x K);Heat of solution: 1.17 kJ/mole
Stability
Stable. Incompatible with strong acids, aluminium, magnesium, strong bases. Hygroscopic.
Storage Conditions
Store at RT.
Topological Polar Surface Area
88.6 Ų
Vapor Pressure
3.35E-05mmHg at 25°C
Viscosity
2.48 (22% solution at 20 °C)
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