260 



Gooch and Cole — Chlorine in Haloid Salts. 



(B) in the absence of a chloride the bromine was completely 

 eliminated from 0*1 grm. of potassium bromide ; but that (C, 

 D) when the chloride was associated with the bromide the evo- 

 lution of bromine was visibly retarded during the process of 

 boiling and slightly incomplete at the final volume of 20 cm3 . 

 In the next set of determinations, recorded in Table II, the 

 concentration by boiling was carried still farther. 







Table II. 



— Preliminary Tests. 







H 2 S0 4 [1:1] 



10cm J : 



Initial Volume, 50cm 3 -55cm 



3 











KBr 



Error in 



H 2 Te0 4 



KBr 



KCl' 



Final 



equal to 



terms of 



taken 



taken 



taken 



volume 



Iodine found 



Br. 



grm. 



grm. 



grm. 



cm 3 . 

 A. 

 15 



grm. 



grm. 



10 





o-i 



0000 



o-oooo 



10 





0-2 



15 



o-oooo 



o-oooo 



10 





03 



15 



o-oooo 



00000 



10 





0-4 



15 



0-0000 



o-oooo 



10 







0-5 



15 



o-oooo 



o-oooo 



1-0 





o-i 



10 



o-oooo 



o-oooo 



10 







0-2 



10 



0-0003 



+ 0-0002 



1-0 





0-3 



10 



0-0016 



+ 0-0011 



10 





0-4 



10 



0-0042 



+ 0-0028 



1-0 







0-5 



10 



0-0086 



+ 0-0058 



1-0 



o-iooo 



0-5 



B. 



15 



o-iooo 



0-0000 



1-0 



01000 



05 



15 



0-1004 



+ 0-0003 



10 



0-4000 



0-3 



15 



0-4002 



+ 0-0001 



1-0 



0-4000 



0-3 



15 



0-4006 



+ 0-0004 



1-0 



0-5000 



0-2 



15 



0-5010 



+ 0-0007 



10 



0-4000 



0-2 



C. 

 10 



0-4000 



0-0000 



1-0 



0-4000 



0-2 



10 



0-4000 



o-oooo 



1-0 



0-5000 



o-i 



10 



0-5006 



+ 0-0004 



1-0 



0-5000 



o-i 



10 



0-5003 



+ 0-0002 



1-0 



0-5000 



0-2 



10 



0-5016 



+ 0-0011 



1-0 



0-5000 



0-2 



10 



0-5022 



+ 0-0015 



From the experiments recorded in A of the table it appears 

 that no chlorine is evolved in the course of concentration to 

 15 cm3 from amounts of potassium chloride up to 0*5 grm. ; but 

 that at a volume of 10 cm3 chlorine begins to appear appreciably 

 when the potassium chloride amounts to 0*2 grm. From the 

 results of B and C it may be inferred that for solutions con- 

 taining 10 cm3 of sulphuric acid [1:1] and 1 grm. of telluric acid 

 at the outset, concentration to a volume of 15 cm3 may be relied 

 upon to remove all the bromine from amounts of potassium 

 bromide up to 0*5 grm. ; but there is at the final volume of 

 15 cm3 or 10 cm3 an incipient evolution of chlorine which, as was 



