Question

define (i)common ion effect (ii)buffer sole (iii)solubility product

Answer 1

Common ion effect : 
Common ion effect causes the suppression in the solubility of an ionic precipitate by addition of strong electrolyte containing common ion.
Buffer solution:
Aqueous solution containing a mixture of weak acid and its conjugate base and vice versa.
Solubility product:
Solubility products is denoted as Ksp. It is the product of dissolved ionic concentrations raised to the power of its stoichiometric coefficients.