Determination of Iodine in Haloid Salts. 



L91 



the solution alkaline. The color of the Iodine vanished gradu- 

 ally under the action of the arsenious acid, but was restored by 

 the addition of 1 grm. of hydrogen potassium arseniate, and 

 again dispelled by another portion of arsenious acid equal in 

 amount to that introduced at Hrst. Heat was applied at this 



Series A. 



KL 



grm. 



o-oooi 



0-000 L 

 O'OOOl 

 O0001 

 0-000 1 

 00001 



o-oooi 



0000 1 



Grms. of 

 Iodine to HfK 

 cm 3 of 

 solution. 



132000 

 132000 

 132000 

 132000 

 132000 

 132000 

 132000 

 I32O00 



grm. 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 



H a S0 4 . 

 [1:1] 



cm 1 

 •_> 



2 

 2-5 

 25 



3 



4 

 4-5 



5 



II,so 4 



strong) in 



100 parts 



by volume. 



NaCl. 



KBr. 

 grm. 



1 



Total 

 vol. 



cm 3 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 



10 

 10 

 12-5 



12- 5 

 15 

 20 

 22 5 

 25 



100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 



grm. 



Reaction 



for 

 Iodine. 



Faint. 



Faint. 



Faint. 



Distinct. 



Distinct. 



Distinct. 



Distinct. 



Distinct. 



Series B. 



O0005 



1 : 26400 



1 



2-5 



12-5 : 100 



10 



Distinct. 



O-000133 



1 : M000 



1 



2-5 



12-5 : 100 



10 



Distinct. 



o-oooi 



1 : 198000 



1 



3 



10 : 100 0-007 



15 



Faint. 



0-000067 



1: 198000 



1 



2-5 



12 5 : 100 



10 



Faint. 



0-000067 



1: 198000 



1 



25 



12-5: 100 



1 10 



Faint. 



o-oooi 



1: 198000 



1 



5 



16-6 : 100 0005 



.... 15 



Distinct. 



o-oooi 



1 : 198000 



1 



5 



16-6 : 100 0-005 



15 



Distinct. 



o-oooi 



1 : 264000 



1 



25 



6-25:100 



20 



Invisible. 



o-oooi 



1 : 264000 



1 



2-5 



6-25:100 



20 



Faint. 



o-oooi 



1: 264000 



1 



5 



12-5 : 100 



20 



Faint. 



0-000033 



1 : 396000 



1 



2-5 



12*5 : 100 



10 



Faint. 



O-000033 I : 396000 



1 



2*5 



12-5 : 100 



10 



Faint. 



O-000033 



1 : 594000 



1 



5 



16 6 : 100 005 



15 



Faint. 



Series C. 









N one. 









O0020 



1: 8000 



1 



Acetic acid 



1*1! grm. 

 (absolute). 





12 



Invisible. 



o-ooio 



1 : 13200 





5 cm 3 25 



100 



_ 10 



Distinct. 



0-0002 



1 : 66000 







5 25 



100 



10 



Faint. 



00010 



1: 13200 



0-2 



5 25 



100 



10 



Marked. 



o-ooo I 



1 : 1H2000 



0-2 



5 25 



100 



-. 10 



Distinct. 



0000033 



1 : 198000 



05 



125 1 25 



100 



.... ... 5 



Faint. 



0-000033 



1: 198000 



05 



1-25 12 5 



100 



5 



Faint. 



o-oooi 



.4000 



2 



4 10 



100 



20 



Faint. 



o-oooi 



1 : 264000 



20 



6 15 



100 



20 



Faint. 



point with the result that the color of iodine showed again 

 faintly, and upon boiling the liquid until its volume decreased 

 to 25 cm it became colorless and yielded no iodine when agi- 

 tated with nitrous acid and chloroform. 



