Schmelzenthalpie von Eis

Messung der zum Schmelzen von Eis benötigten Energie

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

Ziel

Die Schmelzenthalpie von Eis bestimmen, indem eine bekannte Eismasse zu warmem Wasser gegeben und die Temperaturänderung gemessen wird.

Hintergrund

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).

Sicherheitswarnungen

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

Erforderliche PSA

goggles

Materialien

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

Ausrüstung

Polystyrene cup calorimeter Thermometer Analytical balance Paper towels

Durchführung

1

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

3 Min.
2

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

2 Min.
3

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

5 Min.
4

Record the final equilibrium temperature.

2 Min.
5

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

3 Min.
6

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

5 Min.

Erwartete Ergebnisse

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).

Aufräumen

Pour water down the drain. Dry the calorimeter.

Details

Kategorie
Thermochemistry
Schwierigkeit
Beginner (Middle School)
Dauer
25 Min.
Geschätzte Kosten
$3,00
Schritte
6
Materialien
2

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Frequently Asked Questions

What is the objective of Schmelzenthalpie von Eis?
Die Schmelzenthalpie von Eis bestimmen, indem eine bekannte Eismasse zu warmem Wasser gegeben und die Temperaturänderung gemessen wird.
How difficult is Schmelzenthalpie von Eis?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for Schmelzenthalpie von Eis?
Key safety precautions include: Handle warm water with care; Dry ice before weighing to avoid extra water mass.
What materials are needed for Schmelzenthalpie von Eis?
The main materials required are: Ice cubes, Warm water.
What results should I expect from Schmelzenthalpie von Eis?
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).