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# Molar concentration

**Molar concentration**, or **molarity**, or simply concentration, is a term in physical chemistry. It measures the concentration of a solution or mixture.

In chemistry, the **molar concentration**, [math]c_i[/math] is defined as the amount of a constituent [math]n_i[/math] (usually measured in moles – hence the name) divided by the volume of the mixture [math]V[/math]:^{[1]}

- [math]c_i = \frac {n_i}{V}[/math]

The volume [math]V[/math] in the definition [math]c_i = n_i/V[/math] refers to the volume of the solution, *not* the volume of the solvent. One litre of a solution usually contains either slightly more or slightly less than 1 litre of solvent because when a substance dissolves in a solvent it causes volume of liquid to increase or decrease.

The reciprocal quantity represents the dilution (volume) which can appear in Ostwald's law of dilution.

## References

- ↑ International Union of Pure and Applied Chemistry. Amount concentration, c.
*Compendium of chemical terminology*, internet edition. [1]