TITKATION OF HYDEOXYAMINE. 



375 



Acid and 

 carbonate, 

 ccs.of eaoli. 



Total vols, of the dil^ 5 ces. hydroxy^ chlor. 



15 



2.5 



35 



45 



55 



65 



75 



Ces. of iodine solution required. 







9.7 



10.0 



9.95 



10.0 



10.0 



10.0 • 



10.2 



5 



10.3 



10.35 



10.55 



— 



10.45 



— 



lO.G 



10 





10.7 



— 



10.65 



— 



10.6 



11.0 



15 







10.8 



__ 



10.4 



— 



___ 



20 









11.0 



— 



10.85 



11.3 



25 











11.2 



— 



— 



The experiments here recorded show that higli dilation with 

 water causes hydroxyamine to give a higher titer Avith iodine than that 

 calculated ; that this ettect of dilation is increased when sodium saUs 

 are present in large amount ; and that it is still more increased Avlien 

 carbonic acid is also present. They also show that with vei-y high 

 strengths of the solution the titer may be too low. It would seem, 

 therefore, that there must be some deviations from the reaction which 

 is expressed by the equation: — 



2 NH3O + 2 l2= N2O + 4 HI + H2O 



»Should the action of the iodine not go so far, nitrite would be 

 formed, and the Ioav results obtained with very concentrated solutions 

 be accounted for. The production of nitrite from hydroxyamine by 

 various oxidising agents has been noticed by liertoni, so that its 

 formation through the action of iodine should not be improbable. On 

 testing the point I have found that a distinct formation of nitrite 

 does take place, and that, too, not only wdiere concentrated solutions 

 of hydroxyamine are acted upon, but in all cases, even in those 

 where the iodine titer is higher than that indicated l)y the above 



