'( and Md /•--/ > <t< nil i nation of Chlorine. 



299 



distillate. That the influence of the Bulphuric acid is impor- 

 tant, is again demonstrated in the experiments in which 1 cm 

 of nitric acid and 1 grin, of potassium chloride were distilled 

 in the one case with, and in the other without, the addition 

 of Bulphuric acid. 



Ski; i 



Taken 



Taken 



Taken 







' 













Iron 



1 1 N T 3 



Taken 



Initial 



Final 



Time in 



Found 



Loss of 



[l:lj 



Alum. 



Sp. Or. 

 [•40 



Cd= 



=HCL 



volume. 



volume. 



minutes. 



AgOL 



HOI. 



grm. 



grm. 



enr 



grm. 



gtrm. 



rm 



em 3 





grm. 



grm. 









1 



1 





200 



100 



30 



0-0006 



00002 











1 



1 





100 



50 



14 



0.0010 



00003 











1 



1 



0-4888 



50 



15 



10 



0-0049 



00012 



in 





1 



1 



0-4888 



200 



100 



■11 



00031 



0-0008 



10 







i 



1 



0-4888 



100 



50 



16 



00116 



00029 



10 



.". 



01 



1 



0-4888 



400 



300 



24 



d-0004 



00001 



10 





0-3 



1 



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400 



300 



30 



0-0004 



o-oooi 



10 



5 



05 



1 



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400 



300 



30 



00004 



o-oooi 



10 



5 



1 



1 



(i 4888 



400 



300 



27 



o-ooio 



0-0003 



10 



5 



1 



1 



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300 



200 



33 



0-0007 



0-0002 



10 



5 



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1 



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200 



100 



30 



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0-0006 



10 



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100 



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15 



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00023 



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400 



300 



25 



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10 





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400 



300 



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400 



300 



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In the indication of these and previous experiments we found 

 warrant for the prosecution of the quantitative tests of the 

 following series : 



Weighed portions of a standard solution of potassium chlo- 

 ride (whose value was determined by precipitating with silver 

 nitrate with the usual precautions, collecting in a perforated 

 crucible upon asbestos felt the silver chloride found, and dry- 

 ing and weighing it) were transferred to Erlenmeyer flasks of 

 500 cm 3 capacity, water was added with 10 cm 3 of sulphuric 

 acid [1 : 1], 2 grm. of ferric sulphate (either in the form of 

 iron alum or an equivalent amount of ferrous sulphate oxidized 

 in concentrated solution with a sufficiency (03 cm 3 ) of nitric 

 acid) and 1 grm. of potassium iodide, were introduced, the 

 whole volume was brought to 400 cm 3 , and the liquid was 

 boiled with the addition of nitric acid as indicated in the table, 

 1 cm 3 being added after it appeared that all iodine had been 

 expelled. 



The color of the ferric salt renders it impossible to tell by 

 the appearance of the solution the exact moment when the 

 iodine has been expelled, and starch paper loses its sensitive- 

 ness in hot vapors. We bestowed some attention, therefore, 

 upon mean- for the detection of Bmall amounts of iodine in 



