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Scandium fluoride, ScF3, is practically insoluble. a) Calculate the solubility o

ID: 679957 • Letter: S

Question

Scandium fluoride, ScF3, is practically insoluble.

a) Calculate the solubility of ScF3 in pure water. You may neglectthe hydrolysis of the fluoride
ion as it has a negligible impact on the overall solubility.
b) Calculate the concentrations of all aqueous species in asaturated solution of ScF3.
c) Scandium fluoride is somewhat more soluble in acidic solution.Determine the molar solubility
of ScF3 in 1.00 M HNO3.
d) Scandium fluoride is somewhat less soluble in the presence ofNaF. Determine the molar
solubility of ScF3 in 0.050 M NaF.

Useful Information:
Ksp (ScF3) = 4.2 × 10^–18

Explanation / Answer

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