64 



Studies on Solution. 



CHROMIUM CHLORIDE IN WATER. 



Twenty-one solutions were prepared, varying in concentration from 

 c = 2.06 to c = 0.028. The absorption curves show that the edge of the 

 green chromium absorption band at 750/^u is very abrupt, and that beyond 

 SOOju// a solution, for which c = 0.557, is almost as transparent as water. 

 The A c curves have been drawn only 3 wave-lengths on the edge 

 of the band at 724/zju, 744/zju, and 764^/z. At all other parts of the spec- 

 trum the values of a are either too large or too small to be useful for the 

 calculation of A. These three A c curves show that A decreases 



0900 



700 800 900 1.000 1. 100 1.200 l.300/// 



FIG. 24. The A-c and Absorption Curves for Chromium Chloride in Water. 



