8CHLUNDT SPEED OF THE LIBERATION OF IODINE 



19 



SECTION C. 



This section embraces a series of experiments in which 

 excesses of both the hydrochloric acid and potassium 

 iodide enter, the amount of potassium chlorate remaining 

 constant. The results obtained have a direct bearing upon 

 analytical methods as these are the conditions under 

 which chlorates are estimated. 



(1) Series in which botJi the H Cl and K I are doubled* 

 the K Cl O 3 remaining constant and tenth normal, 1 



Excess 



K Cl O 3 + 6 KI + 6 H Cl + 6 H Cl + 6 K I. 



A sample of 400 cc. was made up as follows : 



Normal Hydrochloric Acid 80.0 cc. 



Normal Potassium Iodide 80.0 cc. 



Three times normal Potassium Chlorate 13.3 cc. 



Water 226.7 cc. 



400. Occ. 



I Cubic centimeters' 



Curve A, Figure 4. 



