86 



J. Bhaduri — Decomposition of 



[ffo. 2, 



No. 



Wt. of 

 HgCl 

 grams. 



Wt. of 

 AgCl. 



Corres- 

 ponding 

 chlorine. 



7o O f ci. 



Remarks. 



H. 



1-6022 



•9721 



•2405 



15-01 





J. 



37957 



2-2822 



•5646 



14-87 





K. 



1-5163 



•9219 



•2281 



15-04 



Solution heated. 



L. 



24107 



1-4410 



•3565 



14-79 





M. 



26857 



1-6017 



•3962 



14-75 





Z. 



1-4826 





•2219 



14-97 





A'. 



1-8000 





•2659 



1477 



f Volumetric method with 

 \ chromate indicator. 



B'. 



39362 



... 



•5837 



1483 



Tlie theoretical percentage of chlorine is 15'07. The estimation 

 of chlorine has been made in the gravimetric way at least twenty times. 

 In each case the result has been fonnd to be lower than the theoretical 

 quantity. The final washing was in each case tested for chlorine. Some 

 of the results, however, agree among themselves. Hence it appears 

 that the decomposition is never complete and is dependent upon other 

 circumstances. It is also evident from the previous experiments that 

 the amounts which are obtained when the solutions are heated agree 

 more with the theoretical quantity than those obtained from cold solu* 

 tions. In some of these experiments the alkali remained in contact 

 overnight with no better results. 



The action of heat was next tried. The weighed quantity of 



mercurous chloride was treated with an excess 

 Action of boiling caus- 

 tic-soda on mercurous of pure sodic hydrate solution and the whole 

 chloride. 



heated nearly to the boiling point for about 



fifteen minutes and when cold filtered. The residue was once more 

 treated with caustic soda and then thoroughly washed. The chlorine 

 in the filtrate after acidification was determined as before. In titrating 

 this liquid with standard silver nitrate solution, I have found it con- 

 venient to slightly acidify the solution with dilute nitric acid and then 

 evaporate to a small bulk, say 25 to 30 c.c. with excess of pure preci- 

 pitated calcium carbonate. The following table contains some of the 

 results of the analyses : — 





Wt. of 



Wt. of 



Wt. of 

 CI. grams. 







No. 



HgCl. 



AgCl. 



% of CI. 



Remarks. 





grams. 











N 



•9634 





•1452 



1506 



Volumetric process. 



Q 



1-4466 



•8800 



•2177 



15 05 



Gravimetric ,, 



R 



1-7190 



1-0465 



•2589 



1506 





s 



1-7648 



1-0748 



•2659 



15-07 





V 



•8927 





•1346 



15-OS 



Volumetric „ 



