Chemistry - the Complete Course Series, teaches students quantitative reasoning to solve chemistry problems. The 30 volume series covers all aspects of Chemistry from density to the mole, to Molarity, Stoichiometry and equilibrium. It demonstrates how to ask meaningful questions and conduct careful investigations to build knowledge of chemical and physical concepts and develop the skills to solve mathematical and scientific problems. One important concept to master is the concentration of a solution, in general, and the specific unit of concentration referred to as the Molarity of a solution. The Molarity of a solution is defined as the number of moles of solute divided by the total number of Liters of solution in which this amount of solute is dissolved. This volume teaches two terms that must be distinguished from each other are the terms solute and solvent. There are several different units of concentration used in chemistry. "Concentration" refers to the ratio of the amount of solute to solvent or solute to solution.