Chem Calorimetry Essay

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Chemistry 3/19/13 Calorimetry Lab Report Purpose: Calorimetry is the measurement of the heat flow into or out of a system for chemical and physical purposes. The purpose of this lab was to use calorimetry to find how much heat is absorbed or released when NaCl is dissolved in water. In this case, we will find the heat coming out of the system, in a chemical process. Hypothesis: Once the sodium chloride is put into the water, the temperature of the water will rise. Procedure: 1. Fill up a beaker with 25ml water 2. Pour water into Calorimeter (we had 35 ml) 3. Put in 2 grams of NaCl 4. Close the top 5. Put in Thermometer 6. Record starting temperature 7. Use the stirrer to help stir the water and mix it with the sodium chloride 8. Wait until the temperature stops increasing and record the final temperature Data: When the sodium chloride was added to the water, the water started to heat up. We could see mist hit the top of the container, as the gas was released. The initial temperature was 23 degrees Celsius, and then the final temperature was 41 degrees Celsius. 2 grams of NaCl C=4.184 degrees Celsius. Delta T= 18 M= 35 ml Starting Temp: 23 degrees Celsius Final Temp: 41 degrees Celsius q=(35)(4.184)(18) = 2,636 J q= -2,636 J released Conclusion: My hypothesis was correct. The water did in fact drastically rise as the sodium chloride was dissolving in the water. As a result, -2,636 Joules of heat was released from the chemical reaction with water and NaCl. The reaction was an Exothermic Process, because heat was released into the surroundings. The system in this reaction was the NaCl dissolving, and the surrounding being the
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