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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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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