382 



S. K Moody — Iodides and Iodates. 



the iodide-iodate mixture before and after the passage of the 

 distillate indicates the amount of ammonia volatilized in the 

 boiling. 





A table showin 



g results of such experiments follows : 















Table V. 







. KI. 



KI0 3 



Apprux. 



N/10. 

 . H 2 S0 4 . 



Time 

 ill 



Iodine equivalent of am- 

 monia absorbed in Voit Iodine estimated 

 flask. Drexel flask. 



. in 



Ammo- 

 nium 

 chloride 



Approx. Approx. 



N/10 N/10 

 Na 9 S a O s . I. Dift Na 2 S 2 3 . I. 



Difr\ 



cm 3 . 



grm. 



cm 3 . 



cm 3 . 



hours 



cm 3 . grm. grm. cm 3 . grm. 



grm. 



25 



1-0 



20 



50 



2f 



47*47 0-5918 — 0'0004 4745 0*5916 - 



-0-0006 



25 



1-0 



20 



50 



2f 



47*40 0*5909 — 0'0013 47'44 0*5915 - 



-0*0007 



25 



10 



20 



50 



n 



47-50 0-5922 ±0'0000 47*48 0*5920 - 



-0-0002 



25 



1-0 



20 



50 



2| 



47-45 0*5916 — 0'0006 47'47 0*5918 - 



-0*0004 



25 



1-0 



20 



50 



n 



47*47 0-5918 —0-0004 47*48 0'5920 - 



-0*0002 



It is to be noticed that the time necessary for the hydrolysis 

 of ammonium chloride is less than that for the sulphate. 



On account of the time required, this procedure cannot be 

 considered as having claims to be called an analytical method 

 for determining ammonia, or the acid-ion of either of these 

 ammonium salts, except under circumstances most extraordi- 

 nary. It is here presented because the hydrolysis of ammonium 

 salts must not be ignored in work wherein such salts are heated 

 in solution with the iodide-iodate mixture. 



