COBALT CHLORIDE AND ALUMINIUM CHLORIDE. 



209 



shadow joined this region to the narrow band at 6405. The bands at 6245 

 and 6095 were very intense. The width of the band at 6245 was about 55 



u 



Angstrom units. A solution having the concentration 2.340 showed the 

 entire group of five bands as one single region of absorption, like that indi- 

 cated by fig. 71 (d). This region had the limits 0.724/t and 0.599/1. The 

 transmission of light in the interval from 0.599/i to the beginning of the band 

 in the green was very weak. The most concentrated solution of the series 

 transmitted faintly a narrow band of red. The coalesced group extended 

 from 0.736/t to 0.590/t. The region of transmission in the yellow-green was 

 very dim, and lay in the penumbra of the absorption band whose maximum 

 was near 0.518^. The absorption in the red and yellow was much more 

 complete than for the most concentrated member of the series of solutions 

 that contained calcium chloride. 



The freezing-point lowerings for the solutions containing both cobalt 

 chloride and aluminium chloride are given in the following table: 



TABLE 106. 



* Interpolated from the table given by Jones and Getman: Ztschr. phys. Chem. 49, 

 422 (1904). 



When cooled by the mixture of ethyl alcohol and solid carbon dioxide 

 the most concentrated solutions became very viscous, red jellies, which 

 either under-cooled about 20 and then became solid, or the salt separated 

 out of the jelly. Hence, it was not possible to assign correct values to the 



