22 



Art. 10. — K. Matsimo 



General Consideration of the Absorption Spectra. 



The aquocobaltainminos in which the water molecules co- 

 ordinate in the cis-position tend remarkably with an increase in 

 the number of water molecules, to produce the batliochromic 

 phenomenon and their absorption spectra differ greatly from those 

 of the trans-salts. All the aquocobaltammines, according to the 

 number of the coordinated water molecules, are apt to diminish 

 the second absorption band, which affords an additional proof 

 that the second absorption band of these salts is, as Prof. 

 Y. Shibata has suggested, due to tlie coordinated ammonia. 



Measurements of Electrolytic Conductivity. 



Although I have in the previous chapter demonstrated by 

 means of the absorption apectra that in some of the chlorocobalt- 

 ammines the chlorine atoms are replaced by water molecules in 

 aqueous solution, the confirmation will not be satisfactory Avithout 

 another verification. Therefore I have measured the conductivities 

 of solutions of these salts in order to confirm the above opinion. 

 The metliod used was that devised by Ostwald. The data are as 

 follows : 



Table I. 



[CoCl(NH,)5]S(), [CoClH./)(NH.,)4]SO, [CoCl(H30),(NH,)3]SO, 



ß Ü u 



