18 



BULLETIN OF THE UNIVERSITY OF WISCONSIN 



(3) Series in which the original amount of H Cl is quad- 

 rupled, l 



K Cl O 3 + 6 H Cl + 6 K I + 18 H Cl Excess. 



A sample of 400 cc. was prepared as follows : 



Normal Hydrochloric Acid 160.0 cc. 



Normal Potassium Iodide 40 .0 cc. 



Three times normal Potassium Chlorate 13 .3 cc. 



Water .. .186.7 cc. 



400.0 cc. 



After 24 hours 20 cc. of this mixture kept at the ordinary 

 temperature of the laboratory required 0.5 cc. of twentieth 

 normal sodium thiosulphate. 



1 Curve D, Figure 3. 



