Registration Dossier
Registration Dossier
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EC number: 233-820-4 | CAS number: 10377-48-7
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
Ksp (lithium sulfate anhydrous)= 120.40 mol^3/L^3. The log10 of the Ksp value is 2.08.
Ksp (lithium sulfate monohydrate)= 81.18 mol^3/L^3. The log10 of the Ksp value is 1.91.
Key value for chemical safety assessment
- pKa at 20°C:
- 2.08
Additional information
The solubility equilibrium of lithium sulphate (monohydrate) exists when the chemical compound in the solid state is in chemical equilibrium with a solution of that compound. The equilibrium is an example of dynamic equilibrium in that some individual molecules migrate between the solid and solution phases such that the rates of dissolution and precipitation are equal to one another. When equilibrium is established, the solution is saturated. The concentration of the solute in a saturated solution is known as the solubility.
Dissolution with dissociation is a characteristic of salts like lithium sulfate (monohydrate). Thus, one type of solubility equilibrium is the reversible dissolution with dissociation. Lithium sulfate dissociates in its constituent ions when it is dissolving in water:
Li2SO4 (s) <=> 2Li+(aq) +SO4^2-(aq)
The corresponding solubility product Ksp is expressed as:
Ksp= [Li+]^2*[SO4^2-]
The relation between the solubility S and the solubility product Ksp of a salt AmBn like lithium sulfate is as follows:
S = (Ksp / (m^m * n^n))^(1/(m+n))
m = 2
n = 1
As the solubility S of lithium sulfate (monohydrate) at 25 °C is 342 g/L (349 g/L) the solubility product Ksp could be calculated to be 120.40 mol^3/L^3 (81.18 mol^3/L^3). Expressed in a logarithmic form, the Ksp is log Ksp= 2.08 (1.91).
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