There are distinct factors that play an important role in the enthalpy of

# There are distinct factors that play an important

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is the heat that is exchanged between the metal and the surrounding solution. There are distinct factors that play an important role in the enthalpy of solution; lattice energy, and hydration energy. ( , Jim Clark) Although these factors cannot be measured they attribute to the enthalpy. This experiment will work to verify these relations, and demonstrate the possible use of thermochemistry in the industry. Procedure: 1. First obtain all materials needed: -Calorimeter -Temperature sensor -X amount of Ammonium chloride in grams -100 mL of water for inside the can -100 mL of water for outside of the can -Stir stick -Cotton (to minimize amount of heat escaping) -Graduated cylinder

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2. Next determine the amount of Ammonium Chloride needed to decrease the temperature by 5 . 3. While you are determining the theoretical amount, set up the station by plugging in temperature sensor to the LabQuest and attaching the temperature sensor to the calorimeter. Once the temperature sensor is put in the calorimeter, wrap the cotton around the entry hole to minimize error. 4. Once the theoretical amount is determined, obtain the Ammonium chloride and fill the inner and outer part of the can. Record the temperature of the water. Next add the Ammonium chloride to the outer part of the can and quickly stir so there are no chunks. Then seal the calorimeter and put a timer on for 5 minutes. 5. Once the 5 minutes is over take down the temperature. And determine the enthalpy of change between the two temperatures. 6. Lastly empty out the liquid into a non-organic waste bucket and rise the can under water to get it back to room temperature. And Repeat these steps with the next two amounts of Ammonium chloride. Data/Observations/Results: (Steven) Qualitative Observations: - The solute used in this experiment, Ammonium Chloride NH 4 Cl, consisted of fine, white, opaque crystals.
• Fall '14
• Pell, Wendy

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