4th lab report

4th lab report - ThermoChemistry Introduction Any chemical...

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ThermoChemistry Introduction Any chemical reaction involves a changing of energy as heat. The study of this heat exchange is known as Thermochemistry. In lab you used Thermochemistry to determine the change of heat and temperature when NaOH and HCL were combined to produce NaCl + H 2 O. To better understand the concept of Thermochemistry, you were asked to carry out two different experiments that evolved heat exchange. In part one of the lab you are asked to find the temperature change that occurs when NaOH and HCl are combined. Each group was given a different amount of NaOH and HCL to combine. Group five, my group, was given 25mL of NaOH, 35 mL of HCL, and 0 mL of distilled water. The chemical reaction that took place between these amounts was measured with a calorimeter and then documented. The purpose for this part of the lab was to observe and calculate the change in heat and to record the over all solution of the compound. Part two of the experiment was much like part one. The main difference this was that instead of using an aqueous solution of NaOH, you used a solid form of the compound. Also, the other reagents in the experiment were 1.0 M NaOH, 1.0 M HCl, and 1.0 M HC 2 H 3 O 2. The use of Hess’s law was a prevalent factor when it came time to measure the heat exchange of the chemical reaction. Part one and two showed the importance of having the knowledge of thermochemistry and study of heat exchange in a chemical reaction. Experimental In part one of the lab you are asked to find the change of heat that occurs when NaOH and HCl are combined in a calorimeter. To start you will need to gather your reagents. For group five the reagents are: 25mL of NaOH, 35mL of HCL and 0mL of distilled water. The equation for determining the exchange in heat is q = ms x ∆T. To start calculating the heat change you will determine the amount of heat in the HCL (T 1 ). Next you will find the initial heat of the NaOH (T 2 ). When you have found the initial heat of these two compounds, you can now find the Change in temperature. To find the change in temperature you take T 2 - T 1 = ∆T ( change in temperature). The “m” stands for the mass of the product. This can be found simply by measuring out the compound on an electronic scale. The “s” is the specific heat. This is the amount of heat needed to increase the temperature of the substance. When you have plugged in all the variables you
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This note was uploaded on 08/13/2008 for the course CHEM 184, 188 taught by Professor Hurel during the Spring '08 term at Kansas.

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4th lab report - ThermoChemistry Introduction Any chemical...

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