Lithium sulfate

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Lithium sulfate
Lithium sulfate
Identifiers
CAS number 10377-48-7 YesY
10102-25-7 (monohydrate)
PubChem 66320
RTECS number OJ6419000
Properties[1]
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 (1,578 °F; 1,132 K)
Boiling point 1,377 °C (2,511 °F; 1,650 K)
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
Specific
heat capacity
C
1.07 J/g K
Std molar
entropy
So298
113 J/mol K
Std enthalpy of
formation
ΔfHo298
−1436.37 kJ/mol
Gibbs free energy ΔG -1324.7 kJ/mol
Hazards
EU Index Not listed
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
LD50 613 mg/kg (rat, oral)[2]
Related compounds
Other cations Sodium sulfate
Potassium sulfate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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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[edit]

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 exothermic 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[edit]

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

References[edit]

  1. ^ Patnaik, Pradyot (2002). Handbook of Inorganic Chemicals. McGraw-Hill. ISBN 0-07-049439-8. 
  2. ^ http://chem.sis.nlm.nih.gov/chemidplus/rn/10377-48-7