Entalpia de Fusão do Gelo

Medição da energia necessária para derreter o gelo

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

Objetivo

Determinar a entalpia de fusão do gelo adicionando uma massa conhecida de gelo a água quente e medindo a variação de temperatura.

Contexto

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).

Avisos de segurança

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

EPI necessário

goggles

Materiais

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

Equipamentos

Polystyrene cup calorimeter Thermometer Analytical balance Paper towels

Procedimento

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

Resultados esperados

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).

Limpeza

Pour water down the drain. Dry the calorimeter.

Frequently Asked Questions

What is the objective of Entalpia de Fusão do Gelo?
Determinar a entalpia de fusão do gelo adicionando uma massa conhecida de gelo a água quente e medindo a variação de temperatura.
How difficult is Entalpia de Fusão do Gelo?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for Entalpia de Fusão do Gelo?
Key safety precautions include: Handle warm water with care; Dry ice before weighing to avoid extra water mass.
What materials are needed for Entalpia de Fusão do Gelo?
The main materials required are: Ice cubes, Warm water.
What results should I expect from Entalpia de Fusão do Gelo?
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).