Lithium sulfate

Lithium sulfate (anhydrous)
IUPAC name	Lithium sulfate
Identifiers
InChI	InChI=1/2Li.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2
InChIKey	INHCSSUBVCNVSK-NUQVWONBAF
Standard InChI	InChI=1S/2Li.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2
CAS number	[10377-48-7], 10102-25-7 (monohydrate)
EC number	233-820-4
RTECS	OJ6419000
ChemSpider	59698
PubChem	66320
Properties
Chemical 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	26.1 g/100 mL (0 °C) 23 g/100 mL (100 °C)
Solubility	insoluble in absolute ethanol, acetone and pyridine
Refractive index (nD)	1.465 (β-form)
Structure
Crystal structure	monoclinic (α-form)
Thermochemistry
Std enthalpy of formation ΔfHo298	−1436.37 kJ/mol
Hazards
EU index number	not listed
Flash point	non-flammable
Related compounds
Other cations	Sodium sulfate Potassium sulfate Rubidium sulfate Caesium sulfate
Template:Tick(what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Lithium sulfate is a white inorganic salt with the formula Li₂SO₄. It is used to treat bipolar disorder (see lithium pharmacology). It is soluble in water, though it does not follow the usual trend of solubility versus temperature — its solubility in water decreases with increasing temperature. 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.

References

Template:Bipolar disorder