Pasco TD-8557A Basic Calorimetry Set Manuel d'utilisateur télécharger pdf (Page 13)

Basic Calorimetry Set

Experiment 4: Latent Heat of Fusion

Equipment Needed

• Calorimeter

• Thermometer

• Ice in water (at melting point)

•Warm water

Introduction

Just as steam has a higher internal energy content than water, so water has a higher internal

energy content than ice. It takes a certain amount of energy for the water molecules to

break free of the forces that hold them together in the crystalline formation of ice. This

same amount of energy is released when the water molecules come together and bond to

form the ice crystal.

In this experiment, you will measure the difference in internal energy between one gram

of ice at 0° C and one gram of water at 0° C. This difference in energy is called the latent

heat of fusion of water.

Procedure

1. Measure T

, the room temperature.

2. Determine M

cal

, the mass of the empty, dry calorimeter.

3. Fill the calorimeter approximately 1/2 full of warm water about 15° C above room

temperature.

4. Measure M

cal + water

, the mass of the calorimeter and water.

5. Measure T

initial

, the initial temperature of the warm water.

6. Add small chunks of ice to the warm water, wiping the excess water from each piece

of ice immediately before adding. Add the ice slowly, stirring continuously with the

thermometer until each chunk melts.

7. When the temperature of the mixture is as much below room temperature as the warm

water was initially above room temperature and all the ice is melted, measure the final

temperature of the water (T

final

8. Immediately after measuring T

final

, weigh the calorimeter and water to determine

final

Suggested Additional Experiment

Repeat the above experiment, but, instead of ordinary ice, use the material which is pack-

aged in metal or plastic containers to be frozen and used in picnic coolers.

Data

= ________________

cal

= ________________

cal + water

= ________________

initial

= ________________

1 2 ... 8 9 10 11 12 13 14 15

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Pasco TD-8557A Basic Calorimetry Set Manuel d'utilisateur Page 13

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