When a compound is dissolved in a solvent theconcentrationof the compound is usually given in moles per liter (mol/l or mol·l^-1) which 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:

这个方程can be rearranged to isolate for n or c if it should be desired.