Question: how to find qsp from ksp?
Answer: Consider the reaction the reaction MX(s) <=> M+(aq) + X-(aq)
Qsp is the solubility priduct of the concentration of ions in solution of a dissolving ionic solid.
Qsp = [M+][X-] at any concentration.
Ksp is the solubility product of the concentration of ions in solution at EQUILIBRIUM with the dissolving ionic solid.