Eduard-Job-Foundation for Thermo- and Matterdynamics

Dissolution of Marble in Hydrochloric Acid

Experiment: Dissolution of Marble in Hydrochloric Acid

Procedure:
Hydrochloric acid is poured over two or three pieces of marble

Observation:
Foam develops that contains carbon dioxide.

Explanation:
Calcium carbonate is dissolved by hydrochloric acid, thereby forming gaseous carbon dioxide:

formel1.gif

The reactants combined have a higher chemical potential than the products, i.e. the reaction takes place spontaneously.

Video (mpg4, 0:30)