drous calcium chloride, the rubber connection between the two being left in position. A small rubber stopper was used to close the empty U-tube (B) to prevent evaporation of the water. A second stoppered U-tube filled with anhydrous calcium chloride was used as an absorber also, but this was weighed separately. Finally, the excess hydrogen was allowed to escape through a sulfuric acid trap which prevented moisture of the air entering the absorbers. Before weighing was begun all air was swept out of the apparatus, and the absorption tubes to be weighed were closed. The reducing temperature is low and, after sufficient water had been collected, the bulbed tube was allowed to cool down while the hydrogen gas was still being passed through. The bulbed tube was weighed both before and after the reduction filled with air, while the absorbers were weighed filled with hydrogen both times. After the apparatus had cooled to room temperature, the bulbed tube was allowed to stand in the balance case and weighed last to give the hydrogen time to escape.
REPRESENTATIVE EXPERIMENTAL DATA g.
+ +
Weight of bulbed tube copper oxide residue Weight of bulhed tube Weight of oxygen be for^ reduction: Weight of 2 absorbers Weight of 3rd absorber Total After reduction: Weight of 2 absarhers Weight of 3rd absorber Total Weight of water formed Weight of hydrogen
27.6275 26.3943 1.2332 38.4255 19.7732 58.1987 39.8135 19.7734 59.5869 1.3882 0.1550
0.155 g. of hydrogen combines with 1.2332 g. of oxygen.
.:
1 g. of hydrogen combines with
1n.2315.5 3'
= 7.95 g. of oxygen
or 16 g. of oxygen combines with 2.011 g. of hydrogen
An average of nineteen experiments by Dumas gave 16 arts bv weight of oxwen combine with 2.004 parts
MINUTES OF THE MEETING OF THE EXECUTIVE COMMITTEE OF THE DIVISION OF CHEMICAL EDUCATION The Executive Committee of the Division met in Pittsburgh on September 9th. Present: H. Hale (Chairman), N. W. Rakestraw, Virginia Bartow, R. A. Baker. It was voted to publish an abstract, if possible, of the recent report of the Committee on Chemical Education of the Non-collegiate Type, and to make the complete report available in mimeographed form. Dr. G. J. Esselen was re-elected to the Board of Publication. Secretary N. W. . .RAKESTRAW, MINUTES OF THE ANNUAL BUSINESS MEETING OF THE DIVISION OF CHEMICAL EDUCATION. A. C. S.
Prof. J. R Katz, of Amsterdam, Holland, George Fisher Baker Non-resident Lecturer at Cornell University last year. Prof. Katz is an international authority on the chemistry of starch and starch products. The above snapshot was taken by Prof. C. W. Foulk upon the occasion fof Prof. Katz's visit to Ohio State University in March, 1935.
The annual business meeting tobk place in Pittsburgh on September 10th. The following officers were elected: Chairman: 0. M. Smith Vice-chairman: E. W. Phelan Secretary: N. W. RakestrawExecutive Committee Member-at-large: M. V . McGill It was voted to appoint a committee to cooperate with the College Entrance Examination Board in formulating new requirements in chemistry. A vote of thanks was extended to the Pittsburgh Section in arranging for the meeting. Secretary N. W. RAKESTRAW,
