06 03 calorimetry essay example

Calorimetry is used to measure amounts of heat transferred to or from a substance. To do so, the heat is exchanged with a calibrated object (calorimeter). The change in temperature of the measuring part of the calorimeter is converted into the amount of heat (since the previous calibration was used to establish its heat capacity).

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.

Commercial solution calorimeters are also available. Relatively inexpensive calorimeters often consist of two thin-walled cups that are nested in a way that minimizes thermal contact during use, along with an insulated cover, handheld stirrer, and simple thermometer.

Calculate the calorimeter constant for your calorimeter. Repeat the experiment twice more and use the mean value of the three determinations. Use the same calorimeter assembly as in Choice I. With a graduated cylinder, place 75mL into the calorimeter and cover with the hole-punched lid.