Cliffs AP Chemistry, 3rd Edition

Figure 1

Analysis:

1. A graph was constructed to determine the heat capacity of the calorimeter (see Figure 2).
   From the graph, determine the heat capacity of the calorimeter. The specific gravity of
   water at 23.0°C is 0.998 and at 61.0°C it is 0.983.

Figure 2

Extrapolating the regression line to the Y axis (0 seconds) gives a temperature of 41.4°C at

the moment the room temperature and warm water were mixed.

Average temperature of room temperature and warm water:

..CC. C

2

=23 0%%+61 0 =42 0%

ABCDEFGHIJK

1 30 41.15

2 60 40.9

3 90 40.42

4 120 40.1

5 150 39.91

6 180 39.47

7 Time(sec) Temperature (°C)

8

12

13

14

15

16

17

18

19

9

10

11

41.5

41

40.5

40

39.5

39

30 60 90 120

Time (sec)

Temperature

°C

Heat Capacity of Calorimeter

150 180

Styrofoam cover

400 ml beaker

Water

Polystyrene cups

Glass stirring rod Thermometer

Laboratory Experiments