30 



Studies on Solution. 



The absorption curves for the solutions of ethyl alcohol are similar 

 in their general character to those for methyl alcohol. The minimum 

 of absorption occurs in the same place, at 842/zju, and the steepness of 

 the edges of the bands is much the same. The ethyl-alcohol solutions 

 were of a pure deep-blue in the higher concentrations, becoming a 

 greenish blue as dilution increased. 



The A c curves for 724^ and 744/iju show that A decreases with 

 dilution, and the decrease in this case is far greater than in the case of 

 methyl alcohol. For wave-lengths 764^ to 979/iju in the region of 

 transmission, A is fairly constant. For the region on the edge of the 

 infra-red band, 1,018/iju to l,134jw/>i, the Ac curves show that A 

 increases with dilution. These last-mentioned curves illustrate the 

 magnitude of the error in the determination of A in the case of very 

 dilute solutions. 



TABLE 8. Cobalt Chloride in Propyl Alcohol (Fig. 8). 



