Figure 1 showed that weight of cylinder and cylinder containing sodium chloride solutions are equal to 37.1798 and 42.629 g,respectively. Knowing the mass of sodium chloride solutions is 5.441g (42.629-37.198=5.441).volume of the sodium chloride solutions in the graduated cylinder is 5.13 ml. Therefore, the density of the solutions is calculated to be 1.06g/ml (5.441/5.13=1.06)