What is the difference between ionic product and solubility product ?

Answer 1

They are similar, but apply to different situations. The ionic product, specifically the "acid ionization constant" refers to the product of hydrogen (actually hydronium) ion concentration and the conjugate base (the "A" part of an acid HA) concentration. It quantifies the equilibrium condition of those ions, and is designated Ka See http://en.wikipedia.org/wiki/Acid_dissociation_constant

The solubility product refers to the equilibrium between dissolved components of a compound, and can apply to both ionic and non-ionic solutions. It is designated Ksp. See http://en.wikipedia.org/wiki/Solubility_product