S 14pts, 12min) Will a precipitate form when 60.0 ml of a 0 00750 M solution...

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Answer 1

Answer #1

total volume of solution = (60.0 + 20.0) = 80.0 ml

thus

[F-] = 60.0 * 0.00750 / 80.0 = 5.625 * 10^-3 M

and

[Ca^2+] = 20.0 * 0.0175 / 80.0 = 4.375 * 10^-3 M

CaF2 .................> Ca^2+ + 2 F-

ionic product (Q) = [Ca^2+][F-]^2 = (4.375 * 10^-3) * (5.625 * 10^-3)^2 = 1.38 * 10^-7

as

Q > Ksp

so

precipitation occurs.

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Answer 2

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