Question

The molar solubility of a salt is 1.2 x 10-3M. What is its Ksp of this salt in pure water? If 0.005 of a common ion is added to the solution, what is the new solubility (Common ion effect in salts) The solubility of an unknown salt with a formula XY2 is 3.9 x 10-11 mol/L. What is the value of Ksp of this salt?

Answer 1

Note:-

For the general solubility equilibrium

The K_spexpression is

....(1)

If S is the molar solubility of the compound than the equilibrium concentration of the ions in the saturated solution will be

and

then eq(1) becomes,

For example,

x = 1 , y = 2 and