Entalpía de Fusión del Hielo
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Medición de la energía necesaria para fundir hielo
Objetivo
Determinar la entalpía de fusión del hielo añadiendo una masa conocida de hielo a agua caliente y midiendo el cambio de temperatura.
Antecedentes
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).
Advertencias de seguridad
- Handle warm water with care
- Dry ice before weighing to avoid extra water mass
EPP requerido
Materiales
-
Ice cubes (50 g)From distilled water preferred
-
Warm water (100 mL)About 40°C
Equipamiento
Procedimiento
Add 100 mL of warm water (~40°C) to the calorimeter. Record exact temperature and mass.
Quickly dry ice cubes with paper towel and weigh them. Record mass.
Add the ice to the warm water. Stir gently until all ice melts.
Record the final equilibrium temperature.
Set up the equation: heat lost by warm water = heat to melt ice + heat to warm melted ice to final T.
Solve for ΔHfus. Convert to kJ/mol (multiply by 18.015 g/mol). Compare with 6.01 kJ/mol.
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).
Limpieza
Pour water down the drain. Dry the calorimeter.
Detalles
- Categoría
- Thermochemistry
- Dificultad
- Beginner (Middle School)
- Duración
- 25 min
- Costo estimado
- $3,00
- Pasos
- 6
- Materiales
- 2