26 Art. lO.-K. Matsuno: 



Theoretical Observed 



H2O 6,92 % 7,20 % 6,15 % 6,42 % 



Co 22,68 % 22,65 % 22,41 ^ 



The molecular conductivity of this salt was also measured, 



ß . U . 



500 99,8 



1000 105,8 



which corresponds to the data given for the salts which have two 

 ions, as the following examples indicate : 



^ [Co(N02),(NH3X]Cl [Co(NO.A(NH,),]K [PtCl,(NH3),]Cl [PtCl,NH,]Cl 

 1000 98,35 99,29 96,75 108,5 



If the compound [Co (NHJg CA^'^Os] ' H2O does not change its 

 constitution in aqueous solution, the conductivity should be zero. 

 Therefore, there is no doubt that the following substitution occurs 

 and gives two ions thus : 



[Co(NH3)3CA-N03] + H.O = [Co(NH3)3CA'H20]N03 



The aqdeous solution of the salt shows the reactions of NO3, 

 which confirms the above assumption. The fact that the oxalate 

 radical is firmly fixed to the central atom is the parallel pheno- 

 menon of the carbonatotetrammine cobaltic salt, which in water is 

 stable. Consequently, it can be generalised that in the cobaltam- 

 mines the radicals of the strong acids have the less coordinating 

 power, whilst, on the contrary, the radicals of the weak acids, 

 molecules, such as NH3 and its derivatives and water have the 

 greater coordinating power. 



Summary. 



1. — I have measured the absorption spectra of tlie aquoco- 

 baltammines and thereby demonstrated tlie influence of 

 the coordinated water molecules. 



•2. — The stereochemical configurations of the following 

 col)altammines were tlioroughly determined. 



