24 Art. 10. —K. Matsnno : 



that of 1600 causes an increase of about %)%, giving a mean value 

 of about 250. Tlie effect of time will be seen in table 2. It 

 increases 1\J)% during one hour. Werner and his co-workers^'^ 

 liad previously expressed I»oth the chemical and electrochemical 

 behaviour of the cobaltammine chlorides by the graphic represen- 

 tation of their molecular conductivities and gave the following data: 



Number of ions Molecular conductivity 



at the dilution of 100Ô 



2 Approx. 100 



3 „ 250 



4 „ 480 



It shows that the number of ions of the cobaltammines 

 is proportional to the conductivity of the salts. While 

 [CoC03(IS[H3)4],SO, and [CoH^O (NH^^äJ^CSOJ, have three and five 

 ions, as well as the molecular conductivities of about 100 and 250 

 respectively, the chlorocobaltammines mentioned above should 

 have molecular conductivities of less than 100, if there occurs no 

 transformation in water because they have two ions, judging from 

 the molecular formula only. The results of the experiments -.are 

 contrary to this supposition and show two or three times the 

 required value for the molecular conductivities. They vary very 

 much with the dilution, especially in the triammine and diammine 

 complex salts, which have values approximating to the maximum 

 conductivity of hydrochloric acid, i.e. 403, at a dilution of 1600. 

 The fact that strong acid radicals such as CI or NO3 when 

 coordinated in the cobalt complex nucleus to form a complex 

 salt sometimes show ionic reactions, in other words, dissociate in 

 aqueous solution, was demonstrated by Werner. For example, 

 the purpureo cobaltammine chloride, if dissolved in water, under- 

 goes to a certain extent the following substitution : 



[Co CI (NH.,)5] CI2 + HP — ^ [Co H.,0 (NH,\] CI, 



The above system I'eacts sometimes acidic when the coi>vei'- 

 sion takes place, thus : 



(1) Wcruoi- : New Tdias of Iiior<fanic Chemistry, P 157 Ä: 184. 



