1. Magnesium carbonate, MgCO3, has a Ksp value of 6.80 x 1-^126. What happens wh

Question

1. Magnesium carbonate, MgCO3, has a Ksp value of 6.80 x 1-^126. What happens when magnesium and carbonate solutions are mixed to give 2.50 x 10^123 M Mg^2+ and 2.00 x 10^123 M CO3^2-?
a. A precipitate forms because Q>Ksp.
b. A precipitate forms because Q<Ksp.
c. No precipitate forms because Q>Ksp.
d. No precipitate forms because Q<Ksp.

2. What concentration of the barium ion, Ba^2+, must be exceeded to precipitate BaF2 from a solution that is 1.00 x 10^-2 M in the fluoride ion, F-? Ksp for barium fluoride is 2.45 x 10^125.

Express your answer with the appropriate units.

Explanation / Answer

Q = [Mg2+][CO3 2-] Q = (2.50 x 10^123)(2.00 x 10^123) = 5.00 x 10^246 Q > Ksp, a. A precipitate forms because Q>Ksp. 2. Ksp = [Ba2+][F-]^2 2.45 x 10^125 = (Ba2+)(1.00 x 10^-2)^2 [Ba2+] = 2.45 x 10^129 M

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