MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Weighing copper sulphate. Copper sulphate being weighed on a digital mass balance. The mass is being measured to two decimal places. Such measurements are carried out in analytical experiments used to calculate chemical formulae and the ratios in reaction equations. An example is heating the copper sulphate until the blue colour is lost and re-weighing it. This allows calculation of the amount of water present in this hydrated (blue) form of copper (II) sulphate.
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