Determination of the density of liquids

Principle

In the determination of the density of solids in Experiment ME 1.5, the density was determined as the quotient of mass and volume from a weighing to determine the mass and measurement of volume by different methods. As a prerequisite for this experiment, it was assumed that the mass and volume of water are numerically identical, i.e. that the quotient of both - the density - has a value of 1 g?cm³.

This should now be confirmed experimentally by the same method: weighing a quantity of a material and measuring its volume.

1. First the students are to determine the density of water from a volume measurement in a graduated cylinder, a weight determination and then a calculation.
2. The students should then determine the density of a table salt solution (approx. 10%) which they made themselves by the same method.

Task

Can liquids have different densities?

The density ? can be determined from a mass and a volume measurement. The unit of density is kg?dm³ or g?cm³ or g?ml. In this experiment the density of water and of a salt solution are determined.

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