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XXVII. 



A SIMPLE FOEM OF APPAEATUS FOE OBSEEVING THE EATE 

 OF EEACTION BETWEEN GASES AND LIQUIDS, AND ITS 

 USE IN DETERMINING THE EATE OF SOLUTION OF OXYGEN 

 BY WATEE UNDEE DIFFEEENT CONDITIONS OF MIXING. 



By H. G. BECKEE, A.E.C.Sc.T., A.I.C, 

 Demonstrator in Chemistry, Eoyal College of Science, Dublin. 



Read May 24. Published August 29, 1921. 



I. — Introduction. 



The apparatus described in this paper was primarily devised as an alternative 

 method of carrying out the " Five Days' Dissolved Oxygen Absorption Test," 

 and is based on a principle previously utilized by Professor Adeney for the 

 same purpose.^ 



In the course of the work, however, it became apparent that the principle 

 was capable of wider application, and the apparatus was finally designed with 

 a view to its possible use for the study of gas-liquid systems in general. 



The effect of different rates of stirring on the rate of solution of oxygen in 

 water has been determined by means of the apparatus, and the results of the 

 experiments are given in this communication, as they have a direct bearing 

 on some previously published work.^ 



II. — The Principle on which the Apparatus is Based. 



The principle utilized in the apparatus depends on the changes in pressure 

 which occur when a liquid is placed in contact 

 with a closed volume of a gas which it is 

 capable of absorbing, and the action of the 

 apparatus will be understood by reference to 

 fig. 1. 



In tlie system shown in the diagram there 

 is a volume of gas V^ connected through a • 

 manometer with a volume of gas Fi, there being 

 sufficient liquid in Vi to ensure saturation of 

 the gas with vapour, and the liquid under test 





Fig. 1. 



1 Fifth Report, Royal Commission on Sewage Disposal. Appendix vi, p. 4.38. 



2 Adeney and Becker; Scientific Proc, R.D.S., 1919, xv, p. 609, 



