बर्फ की संलयन एन्थैल्पी
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बर्फ पिघलाने के लिए आवश्यक ऊर्जा मापना
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
सामग्री
-
Ice cubes (50 g)From distilled water preferred
-
Warm water (100 mL)About 40°C
उपकरण
प्रक्रिया
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.
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.
विवरण
- श्रेणी
- Thermochemistry
- कठिनाई
- Beginner (Middle School)
- अवधि
- 25 मिनट
- अनुमानित लागत
- $3.00
- चरण
- 6
- सामग्री
- 2