The density of a solution depends on its concentration, that is, how much solute (solid) is dissolved in the solvent (liquid). If
the density of a solution is plotted on a graph against the concentration of solute, a regular pattern is evident—density is proportional
to concentration. The resulting graph, called a calibration curve, shows a straight-line relationship between the density of a
solution and the concentration of solute. A calibration curve can be used to determine the concentration of solute in an unknown
solution whose density has been measured