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] 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 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 monohydrate IUPAC name Lithium sulfate — water (1:1) Identifiers InChI InChI=1/2Li.H2O4S.H2O/c;;1-5(2,3)4;/h;;(H2,1,2,3,4);1H2/q2*+1;;/p​-2 InChIKey RKGLUDFWIKNKMX-NUQVWONBAN Standard InChI InChI=1S/2Li.H2O4S.H2O/c;;1-5(2,3)4;/h;;(H2,1,2,3,4);1H2/q2*+1;;/​p-2 CAS number [10102-25-7] EC number 233-820-4 RTECS OJ6419000 ChemSpider 145317 Properties Chemical formula Li2SO4·H2O Molar mass 127.95 g/mol Appearance White crystalline solid Density 2.06 g/cm3 Melting point 140 °C dehydr. Solubility in water 34.9 g/100 mL (25 °C) 23 g/100 mL (100 °C) Solubility insoluble in absolute ethanol, acetone and pyridine Refractive index (nD) 1.465, 1.477, 1.488 Structure Crystal structure monoclinic Hazards EU index number not listed Flash point non-flammable  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.