﻿530 



Dr. T. Ewan on the Rate of Oxidation 



Table VI. {continued). 



Time in 



Pressure Pressure 



Total 









minutes from 



of of 









the beginning. 



Oxygen. 



Aldehyde. 



pressure 







x x io°. 



t 



Pv 



P 2 - 



P. 













489-6 



291-2 



799-0 









72 



485-3 



281-7 



790-5 







0-96 



98 



480-6 



273-2 



781-0 







1-52 



132 



475-5 



251-2 



766-5 







1-81 



163 



4700 



249-2 



749-0 







2-05 



229 



457-2 



220-5 



707-5 







2-87 



325 



441-6 



186-1 



657-5 







2-94 



464 



424-2 



159-5 



603-5 







3-11 



617 



409-1 



1191 



558-0 







3-18 



1330 



376-5 



57-2 



463-5 







300 



Temperature = 20°-5 to 20°7. 







Total pressure of residual gas = 



173-5 mill 



Partial pressure of residual oxygen = 



376-5 





Partial pressure of residual nitrogen — 



18-2 





Vapour-pressure of acetic acid at 20° -6 . . . . = 



11-6 





k' = 0-00103. 







t. 



Pv 



V v 





KxlO 5 . 







595-7 



270-0 



878-0 









146 







878-0 













533-2 



241-6 



785-7 









136 



532-3 



239-9 



783-1 









1163 



532-3 



239-7 



782-9 













3730 



178-5 



559-3 









353 



346-8 



122-8 



488-8 







2-82 



421 



344-6 



118-2 



481-8 







2-59 



501 



342-7 



114-2 



476-1 







2-34 



Temperature = 20°-8. 







Total pressure at end of experiment - 



442-6 millim. 



Partial pressure of oxygen at end of experiment . . = 



331-9 



„ 



Partial pressure of nitrogen at end of experiment . = 



7-8 



„ 



Jc' = 0-001767. 







Another experiment at 21 0, 4 gave no reaction when the 

 pressure of the oxygen was 599 millim., and also when it was 

 reduced to 530 millim. the reaction did not begin. 



The calculation of the amount of change which had occurred 

 at any moment, from the change of pressure, is complicated 

 by the solvent action of the liquid acetic acid formed on the 

 aldehyde-vapour : owing to this the amount of change at any 



