In a saturated solution of MgF_2 at 18 degree C, the concentration of Mg^2+ is 1

Question

In a saturated solution of MgF_2 at 18 degree C, the concentration of Mg^2+ is 1.21 times 10^-3 molar. The equilibrium is given below: MgF_2(s) bidirectional Mg^2+(aq) + 2F(aq) Write the expression for the solubility-product constant, K_sp, and calculate its value at 18degree C. Calculate the equilibrium concentration of Mg^2+ in 1.000 liter of saturated MgF_2 solution at 18degree C to which 0.100 mole of solid KF has been added. The KF dissolves completely. Assume the volume change is negligible. Predict whether a precipitate of MgF_2 will form when 100.0 ml of a 3.00 times 10^-3 molar Mg(N0_3)_2 solution is mixed with 200.0ml of a 2.00 times 10^-3 molar NaF solution at 18degree C. Calculations to support your predictions must be shown.

Explanation / Answer

a) Solubility product constant, Ksp = [Mg2+ ] [F- ]2 = (1.21x10-3 ) (2.42x10-3 )2 = 7.09x10-3

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