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Determination of the melting enthalpy of a pure substance with Cobra4

Determination of the melting enthalpy of a pure substance with Cobra4

Item no.: P3020961

Experiment Type: Teacher Experiment, Laboratory Experiment

Difficulty Expenditure of Time print
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Principle

When a solid melts, energy is required for the destruction of the crystal lattice. A substance whose melting point lies slightly below room temperature is first cooled until it solidifies and then melted in a calorimeter. The melting enthalpy is calculated from the decrease in temperature due to the melting process which is measured in the calorimeter.

Benefits

  • Part of a system solution - Easily expandable for further experiments
  • Simplified implementation: all pre-settings already prepared
  • Calorimeters with particularly high capacitance

Tasks

  1. Take a temperature-time-diagram for the melting process of dioxan.
  2. Calculate the melting enthalpy and entropy of 1,4-dioxan.

What you can learn about

  • Heat capacity
  • Melting point
  • Latent heat
  • Calorimetry
  • Gibbs' phase rule
  • Enthalpy of sublimation
  • Enthalpy of vaporisation

Necessary accessories

  • Precision balance 6200g/0.01g

 Software inluded. Computer not provided.

Document     Filesize
p3020961e.pdf Experiment guide, English 497.88 KB

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