Lithium sulfate

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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[1]
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[2]
Std enthalpy of formation ΔfHo298 −1436.37 kJ/mol
Hazards[3]
EU index number not listed
GHS pictograms Corr. Met. 1Acute Tox. 4 (oral)
GHS signal word WARNING
GHS hazard statements H290, H302
GHS precautionary statements P234, P264, P270, P301+312, P330, P390, P406, P501
Flash point non-flammable
Related compounds
Other cations Sodium sulfate
Potassium sulfate
Rubidium sulfate
Caesium sulfate
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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[1]
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[4]
EU index number not listed
GHS pictograms Acute Tox. 4 (oral)
GHS signal word WARNING
GHS hazard statements H302
GHS precautionary statements P264, P270, P301+312, P330, P501
Flash point non-flammable
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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

  1. 1.0 1.1 CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-114. ISBN 0-8493-0462-8.
  2. Lithium sulfate. In NIST Chemistry WebBook; National Institute for Standards and Technology, <http://webbook.nist.gov/cgi/inchi/InChI%3D1S/2Li.H2O4S/c%3B%3B1-5(2%2C3)4/h%3B%3B(H2%2C1%2C2%2C3%2C4)/q2*%2B1%3B/p-2>. (accessed 3 December 2009).
  3. HSNO Chemical Classification Information Database, <http://www.ermanz.govt.nz/Chemicals/ChemicalDisplay.aspx?SubstanceID=16725> (accessed 4 December 2009), New Zealand Environmental Risk Management Authority.
  4. HSNO Chemical Classification Information Database, <http://www.ermanz.govt.nz/Chemicals/ChemicalDisplay.aspx?SubstanceID=12894> (accessed 4 December 2009), New Zealand Environmental Risk Management Authority.
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