86 



J. ISha.duri'- JDecomposition of 



[No. 2, 





Wt. of 



Wt. of 

 AgCl. 



Corres- 







No. 



HgCl 



ponding 



7o of CI. 



Remarks. 





grams. 



chlorine. 







H. 



1-6022 



-9721 



•2405 



1501 





J. 



3-7957 



2-2822 



•5646 



14-87 





K. 



1-5163 



•9219 



•2281 



15-04 



Solution heated. 



L. 



24107 



1-4410 



•3565 



14-79 





M. 



2-6857 



1-6017 



•3962 



1475 





Z. 



1-48-26 



... 



•2219 



14-97 





A'. 



1-bOOO 



... 



•2659 



14-77 



r Volumetric method with 

 chromate indicator. 



B'. 



39362 



. 



-5837 



1483 



The 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 found 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 cans- t , , , . 



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 

 lesults of the analyses : — 



No. 



Wt. of 

 HgCh 

 grams. 



Wt. of 

 AgCh 



Wt. of 

 CI. grams. 



7o of CI. 



Remarks. 



N 



Q 

 R 



s 



V 



•9634 

 1-4466 

 1-7190 

 1-7648 



•8927 



•8800 

 1-0465 

 1-0748 



•1452 

 •2177 

 •2589 

 •2659 

 •1346 



1506 

 15 05 

 15 06 

 15-07 

 1508 



Volumetric process. 

 Gravimetric „ 



>> j> 



Volumetric „ 



