How is the concentration of a solution measured?

The concentration of a solution can be measured in various ways, including by measuring the mass of solute per unit volume of solvent (mass/volume percent), the number of moles of solute per liter of solution (molarity), or the ratio of volume of solute to volume of solution (volume percent). Other methods include measuring the absorbance of a solution using spectrophotometry or conducting titration experiments to determine the amount of reactants present.