Chem Pre-Lab 6

Chem Pre-Lab 6 - 03/07/08 Studying the Temperature...

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03/07/08 Studying the Temperature Dependence and Thermodynamics of Electrochemical Cells PURPOSE: The purpose of this lab is to determine the electrode potentials for Zn 2+ and Pb 2+ half- cells. Using these potentials, we will then find the temperature dependence of the cell potential and use it to calculate ∆G, ∆S, and ∆H for the chemical reaction in the cell. After that, we will then find the voltage of a concentration cell and the voltage of a thermocell, then calculate the thermoelectric power of a thermocell. SAFETY: 1. Always wear safety goggles. 2. Handle glassware with care. 3. Copper- Irritant 4. .01M Copper (II) Nitrate- Irritant and Oxidant 5. Lead- Irritant 6. .01M Lead Nitrate- Irritant and Oxidant 7. .5M Potassium Nitrate- Irritant and Oxidant 8. .001M, .01M, .1M Zinc (II) Chloride in .01M HCl- Toxic and Corrosive PROCEDURE: 1. Pour approximately 100 mL of .5 KNO 3 into a 250mL beaker. Prepare six salt bridges. Clean the surfaces of one Cu, one Pb, and four Zn electrodes using steel wool or such.
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Chem Pre-Lab 6 - 03/07/08 Studying the Temperature...

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