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Scandium fluoride, ScF 3 , is practically insoluble in water. a) Calculate the s

ID: 774603 • Letter: S

Question

Scandium fluoride, ScF3, is practically insoluble in water.


a) Calculate the solubility of ScF
3 in pure water. (You may neglect the hydrolysis of the fluorideion as it has a negligible impact on the overall solubility.)

b) Calculate the concentrations of all aqueous species in a saturated 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 of NaF. Determine the molar solubility of ScF
3 in 0.050 M NaF.

Explanation / Answer

a)The solubility of scandium(III) fluoride, ScF3, in pure water is 2.0 x 10-5 moles per liter

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