Enthalpie de Fusion de la Glace

Mesure de l'énergie nécessaire pour faire fondre la glace

Thermochemistry Beginner (Middle School) 25 min ~$3,00

Objectif

Déterminer l'enthalpie de fusion de la glace en ajoutant une masse connue de glace à de l'eau chaude et en mesurant la variation de température.

Contexte

When ice melts, it absorbs energy from its surroundings without changing temperature (latent heat). By adding ice to warm water in a calorimeter and measuring the final temperature, the enthalpy of fusion can be calculated. The accepted value is 6.01 kJ/mol (334 J/g).

Avertissements de sécurité

  • Handle warm water with care
  • Dry ice before weighing to avoid extra water mass

EPI requis

goggles

Matériaux

  • Ice cubes (50 g)
    From distilled water preferred
  • Warm water (100 mL)
    About 40°C

Équipement

Polystyrene cup calorimeter Thermometer Analytical balance Paper towels

Procédure

1

Add 100 mL of warm water (~40°C) to the calorimeter. Record exact temperature and mass.

3 min
2

Quickly dry ice cubes with paper towel and weigh them. Record mass.

2 min
3

Add the ice to the warm water. Stir gently until all ice melts.

5 min
4

Record the final equilibrium temperature.

2 min
5

Set up the equation: heat lost by warm water = heat to melt ice + heat to warm melted ice to final T.

3 min
6

Solve for ΔHfus. Convert to kJ/mol (multiply by 18.015 g/mol). Compare with 6.01 kJ/mol.

5 min

Résultats attendus

The final temperature should be around 10-15°C. Calculated ΔHfus should be approximately 280-350 J/g (accepted: 334 J/g or 6.01 kJ/mol).

Nettoyage

Pour water down the drain. Dry the calorimeter.

Frequently Asked Questions

What is the objective of Enthalpie de Fusion de la Glace?
Déterminer l'enthalpie de fusion de la glace en ajoutant une masse connue de glace à de l'eau chaude et en mesurant la variation de température.
How difficult is Enthalpie de Fusion de la Glace?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for Enthalpie de Fusion de la Glace?
Key safety precautions include: Handle warm water with care; Dry ice before weighing to avoid extra water mass.
What materials are needed for Enthalpie de Fusion de la Glace?
The main materials required are: Ice cubes, Warm water.
What results should I expect from Enthalpie de Fusion de la Glace?
The final temperature should be around 10-15°C. Calculated ΔHfus should be approximately 280-350 J/g (accepted: 334 J/g or 6.01 kJ/mol).