12 Art. 11.— K. Matsono : 



[Com,g^J]] Cl: (1) [Cb.;.,^;{[j]] Cl + H,0--[coen,g^Qg]]a 



(•2) [Co en, g^^^g]] Cl+ H,0 -^ [Co en, ^^ g]] CI3 



(2) [co(NH3),gQ[J]]cLH-H,0_^ [^^°^^I^3).gjo(2)]^^^ 

 [Co..,gjg)] Br : (1) [Coen,^\^ B. + U.ß -^ [Co en,^]^^^ Br, 



With these substitutions, the valency of the saUs varies also. 



r Cl f 1 )~i 14 



The limiting concentration of Co en, ç,^) J Cl changed from tfTw) 

 to .,^.^ during three hours and after 24 hours it gave the value 

 , i.e. value for the trivalent. It is obvious that the tirst 



15000 



substitution took place within half an hour and the second within 



24 hours. As to [co(NH3),^}|gj] Cl and [co m, ^J |,^]] Br, it 

 seemed that the hrst substitution took place very rapidly, for the 

 limiting values of both these fresh solutions Avere „-^^ and after 



30 min. they gave the value ^^r^r^Q corresponding to the trivalent 

 ion. 



(C J [Co (NH3),H,0 C 1] SO,, [Co (NH3),H,0 Cl] Cl 



Each of the above mentioned salts gave the Hmiting value of 

 a trivalent ion, i.e. . ;.^.. .. instead of that of a divalent ion which 

 proved the following changes occurred in their aqueous 'solutions 

 respectivel}': 



