Part A - Calculate the value of Q What is the value of Q when the solution conta

Question

Part A - Calculate the value of Q What is the value of Q when the solution contains 2.00x10-3 M Ca+ and 3.00 x 10-2 MSO42? Express your answer numerically. View Available Hint(s) Submit Part B This question will be shown after you complete previous question(s). PartC What concentration of the barium ion, Ba2+, must be exceeded to precipitate BaF2 from a solution that is 1.00 x 102 M in the fluoride ion, F Ksp for barium fluoride is 2.45x10-5 Express your answer with the appropriate units. View Available Hint(s) Value Units Submit

Explanation / Answer

A) CaSO4 (s) --> Ca+2 + SO42-

the reaction quotient (Q) is given by

Q = [Ca+2] [SO42-]

Q = [2 x 10-3 ] [3 x 10-2]

Q = 6 x 10-5

B)

BaF2 (s) ---> Ba+2 + 2 F-

the expression for Ksp is

Ksp = [Ba+2] [F-]^2

2.45 x 10-5 = [Ba+2] [0.01]^2

[Ba+2] = 0.245 M

so

the concentration of Ba+2 must exceed 0.245 M

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