Scandium fluoride,ScF3, ispractically insoluble. a) Calculate thesolubility of S
ID: 679928 • Letter: S
Question
Scandium fluoride,ScF3, ispractically insoluble.
a) Calculate thesolubility of ScF3 in pure water. You may neglect the hydrolysis of thefluoride
ion as it has a negligibleimpact on the overall solubility.
b) Calculate theconcentrations of all aqueous species in a saturated solution ofScF3.
c) Scandium fluoride issomewhat more soluble in acidic solution. Determine the molarsolubility
of ScF3 in 1.00M HNO3.
d) Scandium fluoride issomewhat less soluble in the presence of NaF. Determine themolar
solubility of ScF3 in 0.050M NaF.
Explanation / Answer
We Know that: (a) ScF3 -----> Sc+3 + 3 F- If we ignorethe solubility of F- . The Kspof ScF3 = Solubility of Sc+3 Solubilityof Sc+3 = 4.2 x 10^-18 M (b) The Conc .all the aqueous ions of ScF3 is Sc+3 = 4.2 x 10^-18 M 3F - = 12.6 x 10 ^ -18 M (c) ScF3 + 3 HNO3 --------> Sc (NO3)3 + 3 HF Solubility of ScF3 = ( Ksp / 27)1 / 4 = 1.9859 x 10-5 M (d) ScF3 + NaF ------> Sc+3 + 3 F- S 3S +0.050 Ksp = S ( 3S + 0.050 ) 3 By Solving the above equation we get : S = 3.36 x 10-14 M (a) ScF3 -----> Sc+3 + 3 F- If we ignorethe solubility of F- . The Kspof ScF3 = Solubility of Sc+3 Solubilityof Sc+3 = 4.2 x 10^-18 M (b) The Conc .all the aqueous ions of ScF3 is Sc+3 = 4.2 x 10^-18 M 3F - = 12.6 x 10 ^ -18 M (c) ScF3 + 3 HNO3 --------> Sc (NO3)3 + 3 HF Solubility of ScF3 = ( Ksp / 27)1 / 4 = 1.9859 x 10-5 M (d) ScF3 + NaF ------> Sc+3 + 3 F- S 3S +0.050 Ksp = S ( 3S + 0.050 ) 3 By Solving the above equation we get : S = 3.36 x 10-14 M By Solving the above equation we get : S = 3.36 x 10-14 MRelated Questions
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