# Calculating concentration

When a compound is dissolved in a solvent, the concentration of the compound is usually given in moles per liter (mol/L or mol·L^{-1}) which is also called molarity, M. To calculate how large a volume, V, of a solution with a known concentration, c, to use in order to obtain a certain number of moles, n, the following equation is used:

The equation can be rearranged to isolate for n or c if it should be desired.