RATE OF DIFFUSION OF IODINE IN KI 



495 



PRELIMINARY TABLE. 



Diffusion of iodine in potassium iodide. 



Values obtained by Dr. Graham Edgar alone previous to the author's 

 first work. This work was done with apparatus involving the four layer 

 system, and each value given is the mean of the most concordant values 

 for two, three, or four layers. 



100 grams KI per litre K = 1 .093 



200 grams KI per litre K = 1. 191 



400 grams KI per litre K = 1.278 



Translating into terms of normal solutions the above becomes: 



0.60 normal K = 1.093 



1.20 normal K = 1.191 



2.40 normal K = 1.278 



These values are used in future tables, due note being made of the fact 

 in each case. 



TABLE I. 



Diffusion of Iodine in Potassium Iodide Solution . 



Normality of KI3, is- Normality of KI, 1. 



0.8106: 



12 



K = y 0.233 Xlogio 



Yo 



Vo - 2V, 



* Letters in this column were distinguishing marks on cylinders, scratched with 

 a diamond. 



t These cylinders were not in thennostat, but in a vacuum flask filled with water 

 at room temperature. 



Bracketed values for K are not counted in mean. 



(Work done under guidance of Dr. Graham Edgar.) 



