216 



HYDRATES IN AQUEOUS SOLUTION. 



and the last difference equals 0.415. The concentration of the solution of 

 calcium bromide was 4.236. 



As the concentration of the dehydrating agent increased, the color of the 

 solutions changed from pale-blue to deep greenish-brown, passing through all 



0.09 



0.08 



0.07 



0.06 



O 



3 O.OS 



c 

 o 

 O 



0.04 



0.03 



0.02 



O.OI 



CuCI 2 + CaC! 2 





0.5 1.0 1.5 2.0 2.5 



Concentration 

 FIG. 75. 



3.0 



3.5 



4.O 



intermediate shades of bluish-green, clear green, and yellowish-green. Ex- 

 cept in very thin layers, the most concentrated solutions were completely 

 opaque to light. In very thin layers the most concentrated solution was of 

 a dark-red color, similar to that of liquid bromine. 



