An aqueous solution at 25°C is 0.10 M in Ba2+and 0.50 M in Ca2++ ions. We wish to separate the two by taking advantage of the different solubilities of their fluorides, BaF2 and CaF2.(a) What is the highest possible fluoride ion concentration that allows only           one solid fluoride salt to be present at equilibrium? Which ion is present         in  the solid—Ba2+ or Ca2+?(b) What fraction of the less soluble ion still remains in solution under the             conditions of part (a)?

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter18: Principles Of Chemical Reactivity: Entropy And Free Energy
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An aqueous solution at 25°C is 0.10 M in Ba2+and 0.50 M in Ca2++ ions. We wish to separate the two by taking advantage of the different solubilities of their fluorides, BaF2 and CaF2.
(a) What is the highest possible fluoride ion concentration that allows only           one solid fluoride salt to be present at equilibrium? Which ion is present         in  the solid—Ba2+ or Ca2+?
(b) What fraction of the less soluble ion still remains in solution under the             conditions of part (a)?

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