Question

A solution contains an unknown amount of dissolved calcium . Addition of 0.112 mole of K3PO4 causes complete precipitation of all the calcium. How many moles of calcium were dissolved in the solution?

Answer 1

1) use the M method to solve the following linear programming problem:

Minimize C+ -5x+10x+15x

Subject to 2x+3x+x <(or equal to) 24
x-2x-2x >(or equal to) 1
x,,x,x>(and equal to) 0

Answer 2

3Ca^2+ + 2PO4^3- ==> Ca3(PO4)2(s)

If you added 0.112 moles K3PO4, (and none of the K3PO4 remains unreacted, then use the coefficients in the balanced equation to determine the amount of Ca.
0.112 mole K3PO4 x (3 moles Ca^2+/2 moles PO4^3-) = ??moles Ca^2+.