The Coagulation of Arseuious Sulphidi' Sol )iy Cobaltio Couiplexes XI 



In the case of these salts tlie IVjllowing hydrolytic reactions are 

 most probable : 



Tb(NO,), + H,0 = TliO(N03\, + -2HN03 

 Zr CI, + H„ü = ZrOCl, + 2HC1 



Chemical Changes of the Cobaltammines in their 

 Aqueous Solutions. 



The chemical clianges in tlie aqueous solutions of cobaltam- 

 mines with co-(^)rdinated radicals of strong acids were clearly 

 explained by the author in his previous paper [This Journ., the 

 same Vol. Art. 10]. He has been able to confirm it by the study 

 of the limiting values as follow : 



(A) [Co (NH3), NO, CI] CI . H,0 



If the above salt dissociates in the aqueous solution, thus, 

 [Co(KH3)4NO,Cl]Cl aq. :|: [Co(KH,)4NO,Cl] + Cr 



the limiting value obtained by it will be -lorj,^ (see the chapter of 

 the valency rule). Jjut the experimental data did not agree there- 

 with and it gave ..^^q iii =-^ fresh solution and ,^ .^ when oO min. 



have elapsed. The latter figure corresponded with that of a 

 divalent ion. It proves the truth of the author's suggestion that 

 this kind of salt undergoes a furtlier substitution as below : 



[Co(KH3),IsO.Cl]Cl + H,0 ^ [Co(NH3),NO,H20]CL 



(B) [Co.«,g|J]]ci, [Co(NH3),g[J]]ci and [Co .n, gj! [.^]] Br. 



It is a well known fact that the above mentioned salts undergo 

 colour changes when they are dissolved in water. The author 

 proved in his previous paper [loc. cit.] the following substitutions 

 would take place : 



