Looking for an introductory lab on Molarity, Dilutions, or Beer's Law? Try out the challenge lab! Students are given the task of making several dilutions at various molarities. They are then given an unknown concentration in which they are to figure out the molarity making use of Beer's Law, absorption, and molarity calculations for making dilutions. Included is a informational page with teacher tips, suggestions, equations, material list, and safety information.