LECTURE EXPERIMENTS in GENERAL CHEMISTRY*" ZV. The Law of Partial Pressures.
V. The Law o f Digusion of Gases
SAMUEL MORRIS AND ALVAH JOHN WASHINGTON HEADLEE West Virginia University, Morpantown, West Virginia
..
:.
T
HE GAS laws offer considerable difficulty to general chemistry students unless well illustrated by experiments. The conventional form of Boyle's law apparatus lends itself readily to lecture demonstration. The Hempel'gas buret has been found by the authors to be an excellent apparatus for demonstrating Charles' law. Apparatus for satisfactorily demonstrating the laws of partial pressures and diffusion of gases are not available. The two experiments presented in this paper have been developed to provide for the demonstration of these laws. N. THE L A W OF PARTIAL PRESSURES
This law is demonstrated by pumping a gas from one vessel into another vessel of equal volume and determining the pressure changes by means of mercury barometers.