Теплота плавления льда
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Измерение энергии, необходимой для таяния льда
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
Материалы
-
Ice cubes (50 g)From distilled water preferred
-
Warm water (100 mL)About 40°C
Оборудование
Процедура
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.
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.
Детали
- Категория
- Thermochemistry
- Сложность
- Beginner (Middle School)
- Продолжительность
- 25 мин
- Прим. стоимость
- $3,00
- Шаги
- 6
- Материалы
- 2