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Experiment 11
Calorimetry and Hess’s Law
























Purpose- To determine the change in enthalpy for four reactions using calorimetry and Hess’s Law

Procedures:

A. Calibration of the Calorimeter
1. Obtain two copper cylinders and a Styrofoam cup with lid from your lab instructor. Check out a digital thermometer display from the storeroom window.
2. Set up a hot water bath using a 600mL beaker, ring stand, and Bunsen burner. Weigh the two copper cylinders to the nearest 0.01 grams. Carefully place the two copper cylinders in a 25mL test tube. Place the test tube in the hot water bath, and let the bath come to a boil while proceeding with the next step.
3. Weight the clean, dry Styrofoam cup to the nearest 0.01 g. Add 60 mL of distilled water to the cup, and reweigh the cup and water to the nearest 0.01 g. Place the cup in 400mL beaker for stability.
4. Using the digital thermometer record the temperature of the water in the cup......

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Approximate Word Count: 1099
Approximate Pages: 5 (250 words per double-spaced page)

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