إنثالبي انصهار الجليد

قياس الطاقة المطلوبة لإذابة الجليد

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

الهدف

تحديد إنثالبي انصهار الجليد بإضافة كتلة معروفة من الجليد إلى الماء الدافئ وقياس تغير درجة الحرارة.

الخلفية

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).

تحذيرات السلامة

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

معدات الوقاية الشخصية المطلوبة

goggles

المواد

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

المعدات

Polystyrene cup calorimeter Thermometer Analytical balance Paper towels

الإجراء

1

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

3 دقيقة
2

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

2 دقيقة
3

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

5 دقيقة
4

Record the final equilibrium temperature.

2 دقيقة
5

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

3 دقيقة
6

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

5 دقيقة

النتائج المتوقعة

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).

التنظيف

Pour water down the drain. Dry the calorimeter.

Frequently Asked Questions

What is the objective of إنثالبي انصهار الجليد?
تحديد إنثالبي انصهار الجليد بإضافة كتلة معروفة من الجليد إلى الماء الدافئ وقياس تغير درجة الحرارة.
How difficult is إنثالبي انصهار الجليد?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for إنثالبي انصهار الجليد?
Key safety precautions include: Handle warm water with care; Dry ice before weighing to avoid extra water mass.
What materials are needed for إنثالبي انصهار الجليد?
The main materials required are: Ice cubes, Warm water.
What results should I expect from إنثالبي انصهار الجليد?
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).