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Enthalpy Change of the Formation of Calcium Carbonate
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Title: Enthalpy Change of the Formation of Calcium Carbonate
Objective: To determine the enthalpy change of the formation of calcium carbonate
Theory: The enthalpy change of formation is the enthalpy change of the reaction when one mole of a substance is formed from its constituent elements is their standard states under standard conditions. The equation for the formation of calcium carbonate from its elements under standard conditions is Ca(s) + C(s) + 3/2O2(g) --> CaCO3(s) . It is defined as elements or compounds in their normal physical states, a pressure of 1 atm (101325 Nm-2), and a temperature of 25 oC (298 K).Assuming the solution in the polystyrene cup has the same specific heat capacity as water.
The enthalpy change of formation of Calcium Carbonate can be represented as follows by Hess's law:
Apparatus: measuring cylinder x2, polystyrene cup x2, thermometer x1, 100ml beakerx1
Chemicals: Calcium metal, Calcium Carbonate, 1.0M Hydrochloric acid
A. Reaction of calcium with dilute hydrochloric acid
(1) The mass of a clean and dry polystyrene cup is weighted and recorded.
(2) 1g of calcium metal is weighted out approximately
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