Part A - Calculate the value of Q Learning Goal What is the value of Q when the

Question

Part A - Calculate the value of Q Learning Goal What is the value of Q when the solution contains 2.00x102 MSr2+ and 1.50 x 10 3M CrO To understand the relationship between precipitation and the solubility product and to be able to predict whether a substance will precipitate or not. Express your answer numerically View Available Hint(s) Precipitation is the formation of an insoluble substance. For the equation AB(s):-A' (aq) + B (aq), precipitation represents a shift to the left and the production of a solid. From Le Châtelier's principle, we know that when the product of the concentrations of A and B gets above a certain level, the reaction will respond by shifting left to decrease the concentrations of A and B. This critical level Ksp, is a constant at a certain temperature. In this case, Q A ]B-]. where Q is the ion product Submit When Q > Ksp precipitation occurs until Q is equal to K When QKsp, a precipitate does not form Part B This question will be shown after you complete previous question(s). Part C what concentration of the barium ion, Ba" must be exceeded to precipitate BaF2 from a solution that is 1.00 × 10 2 M in the fluoride ion, F? Ksp for barium fluoride is 2.45*10 Express your answer with the appropriate units. View Avaabe int(s) alueUnits Submit

Explanation / Answer

1.

SrCrO4 (s) = Sr2+ (aq.) + CrO42- (aq.)

Q = [Sr2+][CrO42-]

Q = (2.00 * 10-2)((1.50 * 10-3)

Q = 3.00 * 10-5 M2

2.

BaF2 (s) = Ba2+ (aq.) + 2 F- (aq.)

Ksp = [Ba2+][F-]2

2.45 * 10-5 = [Ba2+](1.00*10-2)2

[Ba2+] = 2.45 * 10-1 M

So, to get precipitation, [Ba2+] should be > 2.45 * 10-1 M

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