24 Art. 11. — K. Matsuno : 



and gave the limiting concentration of ^^^^ instead of -.^^qq 

 which verifies tliat there is an ecjuihbrium as indicated below: 



[Co(NH3)3(H.p)2Cl] SO, + H^O X [co(NH3)3(R,0)3] ^\^^ 

 [Co(lS[H3)3H.OCL]Cl gave also the value of ^^^ in place of 



15000 • 



(E) [Co(^^H3)3(H,0).|]CL and [Co(NH3)3(H,0}3|]C]3 



If the above two salts dissociate as [Co(ISIH3^3(HyO)3]Cl3aq. ^ 

 [Co(]S[H3)3(H._,0)3]-+3Cr in their acjueous solutions, the limiting 



concentrations of these salts must be -t^ttt^, but in fact both of 

 them gave tlie value of „^^^ which is the same as those of 



[Co (:NH3)3(H,,0), Cl] so,, [Co(NHs)3PLO CL] CI 

 and [Co(NH3)2(H,OX,ClJ SO,H. 



This is the best confirmation that the following reversible reaction 

 takes place to a certain extent: 



[Co (NH3)3 (H20)3] CI3 aq. ^ [Co (NHglg (Hp)^ Cl] Cl^ aq. 



Summary : 



1. — The relation of the valency of the cobaltammines to their 

 coagulating power on arsenious sulphide sol has been studied and 

 it has shown that the limiting ccncentration can be expressed hy 

 the following formula, 



s; - S, X 4t 



where, ^^n is the limiting concentration (Eq. jMoI) of a N- valent 

 complex ion. The equation can be deduced from Ereundhcli's 

 absorption tlieor}-. 



