Lithium sulfate

Lithium sulfate
IUPAC name Lithium sulfate
Other names Lithium sulphate
Identifiers
CAS number	10377-48-7 Y,  10102-25-7 (monohydrate)
PubChem	66320
RTECS number	OJ6419000
Properties
Molecular formula	Li2SO4
Molar mass	109.94 g/mol
Appearance	White crystalline solid, hygroscopic
Density	2.221 g/cm3 (anhydrous) 2.06 g/cm3 (monohydrate)
Melting point	859 °C
Boiling point	1377 °C
Solubility in water	monohydrate: 34.9 g/100 mL (25 °C) 29.2 g/100 mL (100 °C)
Solubility	insoluble in absolute ethanol, acetone and pyridine
Refractive index (nD)	1.465 (β-form)
Thermochemistry
Std enthalpy of formation ΔfHo298	−1436.37 kJ/mol
Specific heat capacity, C	1.07 J/g K
Hazards
EU Index	Not listed
NFPA 704	0 1 0
Related compounds
Other cations	Sodium sulfate Potassium sulfate
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Infobox references

Lithium sulfate is a white inorganic salt with the formula Li₂SO₄. It is the lithium salt of sulfuric acid.

Properties

Lithium sulfate is soluble in water, though it does not follow the usual trend of solubility versus temperature — its solubility in water decreases with increasing temperature, as its dissolution is an endothermic process. This property is shared with few inorganic compounds, such as the lanthanoid sulfates.

Lithium sulfate crystals, being piezoelectric, are also used in ultrasound-type non-destructive testing because they are very efficient sound generators. However, they do suffer in this application because of their water solubility.

Uses

Lithium sulfate is used to treat bipolar disorder (see lithium pharmacology).