Calorimetry Lab Report
Calorimetry
Chemistry 1412
Spring 2013
Objective: Determine the calorimeter constants in a coffee cup calorimeter, then the calorimeter will used to determine the quantity of heat that flows in a few physical and chemical processes.
Materials used:
Choice I: Choice II: * Safety Goggles Safety Goggles * Distilled water Distilled water * 150 mL beaker 600 mL beaker * 50 mL graduated cylinder 50 ml graduated cylinder * Calorimeter Calorimeter from Choice 1 * Thermometer Thermometer * Hot plate Hot plate Metal block
Procedures:
Choice I:
Nest two similar foam cups into a calorimeter. Make sure they are clean and dry Using a paper punch, make two small holes in a plastic lid that fits tightly over the foam cups. Make one hole in the center and one off to the side. Retrieve the stirring wire and thermometer. With a 50mL graduated cylinder, measure out 50mL of distilled water into a clean, dry 150mL beaker and heat on a hot plate to 70°C-80°C by slowly raising the temperature. Stir with a glass rod occasionally to make sure the heating is uniform. Measure 50mL of cold distilled water and place in the calorimeter setup. As the water is heating, also monitor the temperature of the cold water to find when it reaches equilibrium. Record the temperature of the cold water to the nearest 0.2°C. When the water being heated reaches 70°C-80°C, remove from the heat and let it sit on the lab bench, stirring occasionally. Record the temperature of the hot water to the nearest 0.2°C. Quickly, remove the lid from the calorimeter and pour in the hot water. Replace the lid. Stir for 30 seconds, then begin monitoring the temperature of the combined water. Record the highest temperature reached in the calorimeter to the nearest 0.2°C. Calculate the calorimeter constant for your calorimeter. Repeat the experiment twice more and use the mean value of the three determinations. Choice II:
Use the same
Chemistry 1412
Spring 2013
Objective: Determine the calorimeter constants in a coffee cup calorimeter, then the calorimeter will used to determine the quantity of heat that flows in a few physical and chemical processes.
Materials used:
Choice I: Choice II: * Safety Goggles Safety Goggles * Distilled water Distilled water * 150 mL beaker 600 mL beaker * 50 mL graduated cylinder 50 ml graduated cylinder * Calorimeter Calorimeter from Choice 1 * Thermometer Thermometer * Hot plate Hot plate Metal block
Procedures:
Choice I:
Nest two similar foam cups into a calorimeter. Make sure they are clean and dry Using a paper punch, make two small holes in a plastic lid that fits tightly over the foam cups. Make one hole in the center and one off to the side. Retrieve the stirring wire and thermometer. With a 50mL graduated cylinder, measure out 50mL of distilled water into a clean, dry 150mL beaker and heat on a hot plate to 70°C-80°C by slowly raising the temperature. Stir with a glass rod occasionally to make sure the heating is uniform. Measure 50mL of cold distilled water and place in the calorimeter setup. As the water is heating, also monitor the temperature of the cold water to find when it reaches equilibrium. Record the temperature of the cold water to the nearest 0.2°C. When the water being heated reaches 70°C-80°C, remove from the heat and let it sit on the lab bench, stirring occasionally. Record the temperature of the hot water to the nearest 0.2°C. Quickly, remove the lid from the calorimeter and pour in the hot water. Replace the lid. Stir for 30 seconds, then begin monitoring the temperature of the combined water. Record the highest temperature reached in the calorimeter to the nearest 0.2°C. Calculate the calorimeter constant for your calorimeter. Repeat the experiment twice more and use the mean value of the three determinations. Choice II:
Use the same