S. E. Moody — Hydrolysis of Salts. 



179 







Table 



V. 





SnCl 4 . 







Sn0 2 



Mean of 



2KC1. 



KI. 



KI0 3 



precipitated. 



entire series 



grm. 



grm. 



cm 3 



grm. 



grm. 



0-25 



1-0 



15 



0-0926 ^ 





0-25 



1-0 



15 



0-0933 





0-25 



1-0 



15 



0-0937 





0:25 



1-0 



15 



0-0929 



0-0931 



0-25 



1-0 



15 



0-0932 





0-25 



1-0 



15 



0-0930 





0-25 



1-0 



15 



0-0934 





0-25 



1-0 



15 



0-5931 





Portions of this salt were placed in the Yoit flask with the 

 iodide-iodate mixture, and the mixtures were boiled for 40 

 minutes in a current of hydrogen to transfer the iodine to the 

 Drexel flask charged with potassium iodide. The iodine thus 

 eliminated was estimated with a standard solution of sodium 

 thiosulphate of approximate ~N/10 strength. The results are 

 given in A of the following table. 



An abundance of iodine is liberated immediately upon the 

 addition of the iodide-iodate mixture without boiling, and in 

 order to see to what limit the action might go at the ordinary 

 temperature of the room, a series of experiments was made 

 in which the iodine was removed at once with sodium thiosul- 

 phate, and the solution after standing two hours was titrated 

 with sodium thiosulphate, the total amount of the thiosulphate 

 used being a measure of the iodine eliminated in the reaction 

 and a measure of the tin present. 



The results of these experiments are given in B of the table 

 which follows : 











Table VI. 









SnCl 4 . 

 2KC1. 



KI. 



KIO : 



. Time in 

 minutes. 



Approx. 



N/10 

 Na 2 S 2 3 . 



I. 



Sn0 2 

 calcu- 

 lated. 



Sn0 2 

 precip- 

 itated. 



DifE. 



grm. 



grm. 



cm 3 . 





cm 3 . 



grm. 

 A 

 0-3137 



grm. 



grm. 



grm. 



0-25 



1-0 



15 



40 



24-37 



0-0933 



0-0931 



+ 0-0002 



0-25 



1-0 



15 



40 



24-36 



0-3135 



0-0933 



0*0931 



+ 0-0002 



0-25 



1-0 



15 



40 



24-32 



0-3130 



0-0932 



0-0931 



+ 0-0001 



0-25 



1-0 



15 



40 



24-33 



0-3132 



0-0932 



00931 



+ 0-0001 



0-25 



1-0 



15 



40 



24-36 



0-3135 



0-0933 



0-0931 



+ 0-0002 



0-25 



1-0 



15 



40 



24-35 



0-3134 



0-0933 



0-0931 



+ 0-0002 



0-25 



1-0 



15 



40 



24-34 



0-3133 



0-0932 



0-0931 



+ 00001 



0-25 



1-0 



15 



40 



24-36 



0-3135 



0-0933 



0-0931 



+ 0-0002 



