10 



BULLETIN OF THE UNIVERSITY OF WISCONSIN 



(3) An excess of three molecules of K CI O3 enters,' — 



K CI O3 + 6 H CI + 6 K I + 3 K CI O3 Excess. 

 A sample of 400 cc. of the solution was made up as fol- 

 lows: 



Normal Hydrochloric Acid 40.0 cc. 



Normal Potassium Iodide 40.0 cc. 



Three times normal Potassium Chlorate 53 . 3 cc. 



Water -66.7 cc. 



400.0 cc. 



Duration of reac- 

 tion in minutes. 



Cubic centimeters 

 of solution taken. 



10 



20 



40 



60 



85 



110 



150 



180 



210 



230 



290 



440 



510 



590 



830 



900 



1320 



20 



20 



20 



20 



20 



20 



20 



20 



20 



20 



20 



20 



20 



20 



20 



20 



20 



Cubic centimeters 



of^NaaSsOa 



used in each 

 titration. 



2.8 

 5.0 

 8.25 

 10.6 

 13.5 

 15.4 

 17.35 

 19.25 

 20.25 



Per cent, of 

 Iodine liberated. 



7.0 



12.5 

 20.6 

 26.5 

 33.8 

 38.5 

 43.4 

 48.1 

 50.6 



1 Curve D, Figure 1. 



