The process of reacting a solution of unknown concentration with one of known concentration (a standard solution). Reduction The quantity of solute present in a given quantity of solvent or solution. a reaction where electrons are transferred from one reactant to another The concentration of a solution expressed as moles of solute per liter of solution. A solution of known concentration. The process of preparing a less concentrated solution from a more concentrated one by adding solvent. The point in a titration at which the added solute reacts completely with the solute present in the solution. the process where a substance gains one or more electrons Molarity the process where a substance loses one or more electrons