A sparingly soluble slat having gereral formula, `A_x B_y` and molar solubility S is in equilibrium with its saturated solution. Write the relationship between the solubility and solubility product for such salt.

Explanation

Let S moles per litre be the solubility of the salt `A_x B_y` in water. The molar concentration is saturated solution may be represented as :
`A_(x)B_(y)hArr xx A^(y+)+y B^(x-)xS" "yS`
`K_(sp)=[xS]^(x)[yS]^(y)=x^(x)y^(y)[S]^(x+y)`