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Chemistry lab report Mariam abduljabbar 641122 October 9th 2007 * Purpose: Finding the number of water molecules attached to copper sulphate crystals CuSO4.xH2O. * To avoid error: 1. Do not make too much movement around the balance when taking any mass. 2. Wait till the balance's reading is stable then take the reading. 3. Make sure that the crystals are well distributed in the beaker to be evenly exposed to as much heat as possible. * In case the experiment was repeated for more accuracy in the final results, variables should be controlled: 1. Use the same balance. 2. Use same size and shape of the container (Beaker or evaporating dish) 3. Use exactly the same mass of copper sulphate crystals. 4. Apply the same amount of heat at the same time intervals. 5. Control room temperature. * Apparatus: 1. Beaker. 2. Balance. 3. Watching glass. 4. Glass stirring rod. 5. Hot plate. 6. Tongs. 7. Goggles. * Procedure: 1. The mass of the empty beaker is measured using the balance...

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