Haloid Salts by Means of Telluric Acid. 



271 



Table III. 

 Distillation in Steam from Tubular Flask. 

 [Initial volume 100 cm 3 : H 2 Te0 4 l'O grm.] 



KI 



taken 



KBr 



taken 



KC1 



taken 



1 



* 



CD 



■S-3 3 



> 



KI 



found 



Error in 



terms of 



iodine 



Second 



final 



volumef 



KBr 



found 



Error in 

 terms of 

 bromine 



grm. 



grm. 



grm. 



cm 3 . 



grm. 



grm. 



cm 3 . 



grm. 



grm. 











0-3000 

 0-3000 

 0-3000 



-- 



... 



A 





25 



28 

 26 



0-3001 

 03002 

 0-3000 



+ 0-0001 



+ 0-0001 



0-0000 



0-2000 

 0-2000 



0-3000 

 0-3000 



0-3 

 03 



66 

 66 



B 

 0-2000 

 0-2000 



+ 0-0001 

 + 0-0001 



24 

 24 



0-3003 

 0-3001 



+ 0-0001 

 + 0-0001 



0-3000 

 0-3000 



2000 

 0-2000 



0-3 

 0-3 



65 



60 



0-2995 

 0-2996 



-0-0001 



o-oooo 



25 

 24 



0-2004 

 0-2004 



+ 0-0002 

 + 0-0002 



0-5000 



0-5000 



[0-5000 



0-5000 

 0-5000 

 0-5000 



0-3 



0-3 

 03 



64 

 60 

 64 



0-4989 

 0-4989 

 0-4989 



-0-0003 

 -0-0003 

 -0-0003 



] 23 

 *23 



0-4995 

 0-4995 

 0-5018 



-0-0003 

 -0-0003 

 + 0-0010] 



0-5000 

 0-5000 



0-5000 

 0-5000 



0-5 

 0-5 



62 



64 



0-4993 

 0-4994 



-0 0001 

 -00000 



»23 

 *23 



0-4999 

 0-4998 



-00001 

 -0-0001 



0-0200 ! 

 0-0200 i 



0-4000 J 

 0-4000 



0-3 

 0-3 



64 

 64 



0-0201 | 

 0-0200 



+ 0-0001 1 

 + 0001 



25 1 

 24 



0-4009 ! 

 0-4009 



+ 0-0005 

 + 0-0005 



0-0200 1 

 0-0200 ; 



0-3000 I 

 0-3000 ; 



0-3 

 0-3 



64 

 64 



0205 J 

 0-0205 



+ 0-0004 | 

 + 0-0004 



24 j 



24 | 



0-299? 1 

 0-2998 



-o-oooi 

 -o-oooi 



0-0200 

 0-0200 



00200 1 

 0-0200 



0-5 

 0-5 



65 | 

 64 



0200 

 0-0200 



+ 0-0001 

 + 0001 



24 I 

 24 



0-0213 i 

 0-0201 j 



+ 0-0007 

 + 0-0001 



H2SO4 of lower concentration. 



f H2SO4 of higher concentration. 

 ^HaTeO* = 0-3 grm. added.] 



In the final tests recorded in Table III (B) the solution (con- 

 sisting of the three halogen salts ranging as high as 0'5 grm. 

 each with 15 cm3 of sulphuric acid [sp. gr. 1*015] and 1 grm. of 

 telluric acid) was concentrated to a volume of 6± cm3 -66 cm3 for 

 the removal of the iodine ; and after the addition of 10 cm3 of 

 sulphuric acid [1 : 1] was evaporated to a volume of 2I cm3 for 

 the removal of the bromine. On large charges the amount of 

 telluric acid consumed by the oxidation of the iodide is cal- 

 culated from the iodine found in the receiver and replaced 

 before determining the bromine in order to insure an excess of 

 0'5 grm. of telluric acid at the final concentration. 



The results of these experiments show that the method may 

 be relied upon to determine with accuracy amounts of iodine 

 up to 0'35 grm. (0*5 grm. of potassium iodide) and of bromine 

 up to 0*3 grm. (0*5 grm. of potassium bromide) associated with 



