SCHLUNDT SPEED OF THE LIBERATION OF IODINE 5 



is shown in section B. Section. C, similar to B, gives the 

 effect upon the speed when definite excesses of both potas- 

 sium iodide and hydrochloric acid are used. Section D 

 gives the results obtained from mixtures containing equiv- 

 alents of the components in fifth normal and two-fifth nor- 

 mal solutions respectively. The acceleration in the speed 

 by various organic and inorganic acids forms the fifth and 

 last section of the results. 



To facilitate comparison, the results obtained in similar 

 series are graphically represented in the same figure. In 

 plotting the curves the axis of abscissas was chosen to denote 

 the time of the reaction, each space representing one hun- 

 dred minutes, while the percentages of iodine liberated are 

 plotted on the axis of ordinates. 



SECTION A. 



Series in lohich equivalents of K Cl 3 , H Cl, and K I enter 

 in deci-normal solutions, 1 according to the reaction, 



K Cl O 3 + 6 H C1+ 6 K I = 7 K Cl + 3 H, O + I 6 . 



A sample of 400 cc. of the mixture was prepared as fol- 

 lows: 



Normal Hydrochloric Acid 40.0 cc. 



Normal Potassium Iodide 40.0 cc. 



Three times normal Potassium Chlorate 13.3 cc. 



Water 306.7 cc. 



400. Occ. 

 1 Curve A, Figures 1, 2, 3, 5. 



