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Determining energy change by indirect methods
Member rating: No Rating | Words: 900 | Submitted: Mon Mar 31 2008
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TO DETERMINE AN ENERGY CHANGE BY AN INDIRECT METHOD Aim: To determine the energy change in the reaction Mg(s) + H2O(l) -->MgO(s) + H2(g) Through an indirect method Apparatus: * Polystyrene cup with a lid * 100°C Thermometer (+0.5°C) * Distilled water. * 100 ml of 2 molar HCl * 0.24g of Mg ribbon * 0.1g of MgO powder * Beaker (100ml +0.1ml) * 100 ml measuring cylinder * Balance (+0.0005g) * Small beaker for holding MgO and Mg. * Sand paper * Stirrer Method: 1. Wash all the equipment with distilled water. 2. Clean the Mg ribbon with sandpaper to ensure that all the MgO that formed on it is removed. 3. Measure out 0.24g of Mg on the weighing scale. 4. Now measure 50 ml of 2 molar HCl in the 100 ml measuring cylinder. 5. Now fix a thermometer in the hole of the lid of the polystyrene cup. 6. Now in the same polystyrene cup add the 50ml of HCl and then add the 0.24g...
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