The solubility of a salt MX2 with a molecular weight of 179 g per mole is 12.7 g per L. Calculate Ksp?

Question

The solubility of a salt MX2 with a molecular weight of 179 g per mole is 12.7 g per L. Calculate Ksp?

Answer 1

first calculate molal conc.=molarity of solution

for this u have,

12.7 g in 1 lt.

molar mass=179

no. of moles per lt i.e. molarity=.0709M

next form a rough eqn of reaction tht would proceed

MX2----->>M2- +2X-

this shall be the molal conc. of ions

i.e.M2-=.0709 M

      X-=2*.0709 M

now

Ksp=[M2-][X-]^2

      =.0709*(2*0.0709)^2

      = 0.0014256