TITKATION OP HYDEOXYAMINE. 



371 



Dilution. 



Cub. cents, of iodine solution required. 



(1) 



(2) 



(3) 



(4) 



Undiluted 



9.55 



9.65 



9.55 



9.55 



Diluted to 100 CCS. ... 



10.1 



10.3 



10.0 



10.0 



„ 200 CCS. ... 



10.15 



10.25 



10.2 



10.2 



„ „ 500 CCS. ... 



10.9 



10.95 



10.7 



10.7 



A single drop of the iodine solution, added to 500 ces. of water 

 containing a little sodium bicarbonate, gave in tlie absence of hydroxy- 

 amine a strong colour-reaction with starch, so that dilution of the 

 reagent was not the cause of the greater quantity of it required by 

 the attenuated hydroxyammonium chloride solutions. 



But by tlie large dilution of the hydroxyammonium chloride 

 some dissociation of the salt appears to take ])lace, for the iodine 

 solution is consumed by the diluted solutions, while it is not at all 

 attacked by the stronger ones, in the absence cf sodium bicarbonate. 

 The following results show this. The solutions used were the same 

 as before, but no addition of sodium bicarbDuate was made. 



Dilution. 



Cos. of iodine solution required. 



Undiluted 



Diluted to 100 CCS. 



„ „ 200 CCS. 



„ 500 CCS. 



0.0 

 0.4 

 0.8 

 1.4 



Probibly dependent upon this dissociation is the partial decom- 

 position on standing for some hours of hydroxyamine in very 



