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Determination of the melting enthalpy of a pure substance(with Cobra3 BASIC UNIT)

Product No: P3020911

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.

Tasks

Take a temperature-time-diagram for melting process of dioxan.
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 vaporization

Materiallist (Excerpt)	Product	Amount
Set of Precisionl Balance Sartorius CPA 6202S and measure software, 230 V	49226-88	1
Set calorimetry, 230 V	43030-88	1
Cobra3 Data acquisition set for set calorimetry	43030-30	1
Dewar vessel,500 ml	33006-00	1
Dioxane 1000 ml	31266-70	1
Water, distilled 5 l	31246-81	1
Separator f.magnetic bars	35680-03	1
Universal clamp	37715-00	1
Pasteur pipettes, 250 pcs	36590-00	1
Test tube,200x30 mm,DURAN, PN29	36294-00	2
Right angle clamp	37697-00	1
Rubber caps, 10 pcs	39275-03	1
Wash bottle, plastic, 500 ml	33931-00	1
Rubber stopper 26/32 , without hole	39258-00	2
Laboratory Experiments Physics, Chemistry, Biology andApplied Sciences, CD-ROM, incl. operating manuals	16502-42	1