बर्फ की संलयन एन्थैल्पी

बर्फ पिघलाने के लिए आवश्यक ऊर्जा मापना

Thermochemistry Beginner (Middle School) 25 मिनट ~$3.00

उद्देश्य

गर्म पानी में बर्फ के ज्ञात द्रव्यमान को जोड़कर और तापमान परिवर्तन मापकर बर्फ की संलयन एन्थैल्पी निर्धारित करें।

पृष्ठभूमि

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).

सुरक्षा चेतावनियाँ

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

आवश्यक PPE

goggles

सामग्री

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

उपकरण

Polystyrene cup calorimeter Thermometer Analytical balance Paper towels

प्रक्रिया

1

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

3 मिनट
2

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

2 मिनट
3

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

5 मिनट
4

Record the final equilibrium temperature.

2 मिनट
5

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

3 मिनट
6

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

5 मिनट

अपेक्षित परिणाम

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).

सफाई

Pour water down the drain. Dry the calorimeter.

Frequently Asked Questions

What is the objective of बर्फ की संलयन एन्थैल्पी?
गर्म पानी में बर्फ के ज्ञात द्रव्यमान को जोड़कर और तापमान परिवर्तन मापकर बर्फ की संलयन एन्थैल्पी निर्धारित करें।
How difficult is बर्फ की संलयन एन्थैल्पी?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for बर्फ की संलयन एन्थैल्पी?
Key safety precautions include: Handle warm water with care; Dry ice before weighing to avoid extra water mass.
What materials are needed for बर्फ की संलयन एन्थैल्पी?
The main materials required are: Ice cubes, Warm water.
What results should I expect from बर्फ की संलयन एन्थैल्पी?
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).