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Question 16

The Ksp of barium fluoride is 1.00 x 10–6.
The Ksp of calcium fluoride is 3.90 x 10–11.

An aqueous solution of sodium fluoride is slowly added to a water sample that contains barium ion (4.65×10-2) and calcium ion (5.55×10-2).  What is the remaining concentration of the first ion to precipitate when the second ion begins to precipitate?

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