The Absorption Coefficient of Solution for Monochromatic Radiation. 23 



THE ABSORPTION COEFFICIENT OF THE SOLUTIONS. 

 COBALT CHLORIDE IN WATER. 



Twenty-three solutions were prepared varying in concentration 

 from c = 3.23 to c = 0.1. The more concentrated solutions were quite 

 stable and showed no signs of decomposition, even after standing in the 

 bottles for several days. In the more dilute solutions, however, there 

 appeared a flocculent precipitate which increased their absorption mate- 

 rially. On this account a second set of solutions, whose concentrations 

 varied from c = 1.0 to c = 0.1, was prepared and the measurements of 

 these appear in table 4. 



The absorption curves include the long-wave side of the yellow- 

 green cobalt absorption band and the short-wave side of the infra-red 

 band, and show the region of transmission between the two bands. 

 The minimum of absorption is at 764/x/x. 



.0600 _ 



.oaoo _ 



.0100 _ 



.5 1.0 1.5 2.0 2.5 C 3.0 



FIG. 5. The A-c Curves for Cobalt Chloride in Water. 



