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In chemistry, concentration is the abundance of a constituent divided by the total volume of a mixture. Several types of mathematical description can be distinguished: mass concentration, molar concentration, number concentration, and volume concentration. The term concentration can be applied to any kind of chemical mixture, but most frequently it refers to solutes and solvents in solutions.
In chemistry, the concentration of a solution refers to the amount of substance dissolved in a certain volume of the solution. The volume chosen is 1 dm 3  1 cubic decimetre (which equals 1000 cm 3 or 1 litre). In this unit we will see how the concentration of reactants affects the rate of reaction.