The law of definite proportions

LC1.8.2.2

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Description

The law of constant mass ratios is illustrated in this experiment using copper(II) sulphate-5-hydrate. The copper sulphate is heated in a test tube, releasing the water of crystallisation. The students can recognise this by the colour change of the crystals from blue to white and the drops of liquid separating on the test tube wall. The mass ratio is then calculated from the masses determined. The students realise that the mass ratio of water to copper is always the same despite different initial quantities.

Components of equipment sets

1	6045682 4	Powder spatula, steel, 185 mm
1	667057 4	Test tube rack metal, 20 mm Ø
1	667031 4	Test tube holder 20 mm Ø
1	664048 4	Test tube Supremax 20 mm x 180 mm
1	610010 8	Laboratory safety goggles
1	6667031 8	Teclu burner, propane
1	6729630 4	Copper(II) sulfate-5-hydrate, 500 g Danger H302 H318 H400 H410
1	ADACB501 4	Compact scale 500 g : 0.1 g

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The law of definite proportions

Description

Components of equipment sets

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