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Determining the Enthalpy Change of the Decomposition of Calcium Carbonate.
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| Submitted: Fri Feb 27 2004
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Determining the Enthalpy Change of the Decomposition of Calcium Carbonate. The objective of this experiment was to determine the enthalpy change for the decomposition of calcium carbonate with heat, using an indirect method based on Hess' law. The formulae for calcium carbonate, CaCO3, decomposing with heat: CaCO3 (s) heat CaO (s) + CO2 (g) Hess' Law states that ' the total enthalpy change for a chemical reaction is independent of the route by which the reaction takes place provided the initial and the final conditions are the same. The equation for the experiment not just for the decomposition: (H1 (H3 HCl (H2 HCl Both Calcium oxide and Calcium carbonate react readily with 2 mol dm-3 Hydrochloric acid. The temperature changes during the reaction will be measured and the enthalpy changes (H1 and (H2 calculated. From these enthalpy changes the value for (H3 can be calculated. Method 1. Weigh out a beaker containing between 2.4g and 2.6g of calcium carbonate. Record...
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