PART A – Heat Capacity of the Calorimeter Procedure 1. With a graduated cylinder, measure out 50 mL of distilled water at room temperature. Transfer it to the clean dry calorimeter, which is fitted with a special thermometer calibrated to ?0.1 E C. Stir carefully with the thermometer and allow to stand until the temperature reading remains constant. 2. Take 50 mL of distilled water from the high temperature water bath (~40 E C). Measure the exact temperature and immediately transfer it to the calorimeter, as quickly and completely as possible. Begin measuring the time when all of the water has been added, and note the time and temperature at 15 sec intervals from then on for 4 minutes. Stir constantly both during and after the addition of the hot water.

Calculations

1. Plot a temperature versus time graph and determine the temperature at the instant of mixing by extrapolation. What does the plot tell you about the effectiveness of the styrofoam cup as an insulator?

2. Calculate the heat capacity of the calorimeter, using equation (6),assuming that the specific heat capacity of water is 4.18 J g -1 K -1 and that the density of the water is 1.00 g mL -1