# Lab #1 - Hot and Coldpacks by Erin Samplin Lab Instructor...

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Hot and Coldpacks by Erin Samplin Lab Instructor: Anand Vaidya February 12, 2008

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Purpose – Determine the heat capacity of a calorimeter and the heats of solution of several ionic salts by constant-pressure calorimetry. Then design and test the efficacy of a hot or cold pack that undergoes a 3ºC temperature change in the most cost-effective manner possible. Procedure 50 mL of distilled water was added to a beaker. The mass of the water was determined. M Beaker+Water 123.986 grams M Beaker 77.075 grams M Water (M Beaker+Water - M Beaker ) 46.911 grams The water was poured into a dry calorimeter. A lid was put on it. The temperature of the water was measured with a thermometer every minute until it remained constant. Minute Temperature (ºC) 0 23.2 1 23.1 2 23.3 3 23.2 4 23.2 5 23.2 50 mL of distilled water was added to a second beaker. The mass of the water was determined. M Beaker+Water 124.384 grams M Beaker 77.033 grams M Water (M Beaker+Water - M Beaker ) 47.351 grams The beaker was heated on a hot plate until its temperature rose by about 5-6ºC. Once the temperature stabilized, the final temperature was measured. Final Temperature 40.4ºC The warm water was added to the calorimeter, the lid was replaced, and the contents were swirled. The temperature was recorded until it reached an equilibrium temperature. Equilibrium Temperature 30.9ºC The calorimeter was emptied and filled with room temperature water. It sat for five minutes. The heat capacity was then calculated. Heat Capacity 48.645 J/gºC This was repeated two more times.
Trial 2 Trial 3 M Beaker+Water 125.160 grams M Beaker+Water 127.156 grams M Beaker 77.101 grams M Beaker 77.096 grams M Water (M Beaker+Water - M Beaker

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## This note was uploaded on 05/21/2008 for the course CHEM 342132 taught by Professor Davis during the Spring '08 term at Cornell.

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Lab #1 - Hot and Coldpacks by Erin Samplin Lab Instructor...

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