Eduard-Job-Foundation for Thermo- and Matterdynamics

Experiment 3.5: Ice Calorimeter

Ice_Calorimeter.jpg

Procedure:
A mixture of iron powder and sulfur powder is put into a test tube, and the test tube is subsequently placed in the calorimeter vessel filled with crushed ice. The reaction is initiated by a sparkler.

Observation:
The mixture reacts thereby glowing red. A part of the ice melts. The temperature of the ice remains constant.

Explanation:
Iron reacts with sulfur to iron sulfide:

Formel_Eiskalorimeter.jpg

During the reaction a considerable amount of entropy is emitted. The volume of water collected in the graduated cylinder is indicative of this amount of entropy (0.82 mL of melt water corresponds to the unit of entropy). 

Video (mpg4, 1:32)