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Experiment 9 - Experiment 9 Thermochemistry The purpose of...

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Experiment 9 Thermochemistry The purpose of this experiment was to develop an understanding of heat and heat capacity. As well as calibrating a calorimeter to measure the specific heat capacity of an unknown metal, heat of a solution and heat of neutralization. Balanced equations: 1) NH 4 NO 3 (s) + H 2 O(l) NH 4 OH(aq) + HNO 3 (aq) 2) NaOH(aq) + HCl(aq) NaCl(aq) + H 2 O (l) In part 1 of this experiment the goal was to obtain the heat capacity of the calorimeter (C cal ) by mixing cold water with hot water in a simple calorimeter constructed of styrofoam cups. The heat capacity of the calorimeter was calculated to 18.27J/K. C cal represents how much heat is required by the calorimeter to raise the temperature of the substance one degree. C cal is important to the remainder of this experiment and the proceeding calculations as it is needed to find q . C cal is measured to calculate the change in enthalpy and the heat capacity of the unknown metal. It was necessary to measure it twice in order to assure accurate values, as this is crucial in finding these values. In comparison to the trial 1 C cal calculation, trial two produced a negative value of -5.78J/K, which was impossible. The value must be a positive number since the calorimeter is
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