The Enthalpy of Formation of Magnesium Carbonate

1838 WordsOct 9, 20118 Pages
The Enthalpy of Formation of Magnesium Carbonate By: Jessica Miller T.A: Thomas Lab Partner: Rebekah Melanson Thursday Lab Room 106 Chemistry 1001-A Due Date: Thursday February 3rd 2011 Abstract The purpose of this experiment was to determine the enthalpy of formation of magnesium carbonate in a lab setting. This was done using a calorimeter, which was calibrated by adding a known amount of both hot and cold water. Following the calibration of the calorimeter, HCl was placed into the empty calorimeter and then mixed with magnesium and then MgCO3 and the temperature changes were recorded. The heat lost by the hot water is thus equal to the heat gained by the calorimeter. Experimentally, it is difficult to determine the standard enthalpy…show more content…
In the case of this experiment, the calorimeter consists of a Styrofoam cup placed inside a plastic cup with a cover and thermometer. Experimental Section The first part of this experiment, consisting of calibrating the calorimeter, began by setting up a Styrofoam calorimeter. This was essentially done by placing a Styrofoam cup inside a plastic cup and adding an insulated lid with a small hole for the thermometer. These cups were then placed inside a 250mL beaker for support. A graduated cylinder was then used to place 30mL of tap water in a beaker and set on a hot place until the water reached a temperature of about 60-70C. In following, 50.00mL of cold water was placed into the Styrofoam cup using a 25mL volumetric pipet, and the temperature of the cold water was monitored. After five minutes, if the temperature remained constant, it was recorded to the nearest +/-0.2C. Once the water on the hot plate had been heated to the desired temperature, it was weighed along with the beaker to the nearest +/-0.01g, and the temperature was recorded to the nearest +/-0.2C. Next, the hot water was poured into the Styrofoam cup, the lip was replaced and the thermometer was inserted. The calorimeter then had to be swirled around to ensure the hot and cold water mixed together; the temperature was then recorded every fifteen seconds until a maximum was reached, and then recorded every minute for eight minutes. The second part of this

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