Теплота плавления льда

Измерение энергии, необходимой для таяния льда

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

Цель

Определить теплоту плавления льда, добавив известную массу льда к тёплой воде и измерив изменение температуры.

Предпосылки

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).

Предупреждения по безопасности

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

Требуемые СИЗ

goggles

Материалы

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

Оборудование

Polystyrene cup calorimeter Thermometer Analytical balance Paper towels

Процедура

1

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

3 мин
2

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

2 мин
3

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

5 мин
4

Record the final equilibrium temperature.

2 мин
5

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

3 мин
6

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

5 мин

Ожидаемые результаты

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).

Уборка

Pour water down the drain. Dry the calorimeter.

Frequently Asked Questions

What is the objective of Теплота плавления льда?
Определить теплоту плавления льда, добавив известную массу льда к тёплой воде и измерив изменение температуры.
How difficult is Теплота плавления льда?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for Теплота плавления льда?
Key safety precautions include: Handle warm water with care; Dry ice before weighing to avoid extra water mass.
What materials are needed for Теплота плавления льда?
The main materials required are: Ice cubes, Warm water.
What results should I expect from Теплота плавления льда?
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).