﻿and the Solvate Theory of Solution, 735 



neodymium. Some of the most conclusive evidence for 

 solvation iu solution, furnished by our spectroscopic work, 

 was with the uranous salts. 



The spectrum of: uranous chloride in water is quite different 

 from the spectrum in methyl alcohol, and this, in turn, very 

 different from the spectrum in acetone. A glance at the 

 plate for these solutions would lead us to conclude that we 

 were dealing with three very different absorption spectra. 



In a mixture of water and methyl alcohol, as the amount 

 of water increases the water band X6750 comes out, gradually 

 increasing in intensity. The methyl alcohol band X5050 to 

 X4850 which is probably double, narrows on the red side into 

 a band at X4850. Methyl alcohol bands X4770 and X4600 

 practically disappear and X4670 becomes very weak. In 

 their places appear the water bands X 4700 and X 4550. The 

 methyl alcohol band, X4300 to X4450, becomes weaker and 

 breaks up into a band at X4400 and a band at X4280. The 

 methyl alcohol bands X4230 and X4120 apparently come 

 together, as the amount of water present relative to methvl 

 alcohol increases, and become the water band at X4160. 



It is thus obvious that the aqueous solution shows very 

 different absorption bands from the solution of uranous 

 chloride in methyl alcohol. 



The addition of ethyl alcohol to an aqueous solution 

 of uranous chloride produces a marked change in the 

 spectrum, the ethyl alcohol bands being very different from 

 the water bands. As the amount of ethyl alcohol present 

 relative to water increases, the ethyl alcohol bands come out 

 and the water bands gradually disappear. 



The addition of acetone to a methyl alcohol solution of 

 uranous chloride brings out a number of " acetone " bands 

 between A, 6000 and X6500. A strong absorption band also 

 appears from X6500 to X6800. There is also an acetone band 

 at X 5600. 



The addition of acetone to an aqueous solution of uranous 

 chloride produces a marked change in the spectrum the 

 "acetone" bands being very different from the "water" 

 bands. The acetone solution absorbs much less in the reo-ion 

 X 6500. The aqueous solution has a characteristic band at 

 X6750. There are acetone bands at X4920, X4750 and 

 X 4590; and water bands at X 4980, X 4700, and X 4570, ' The 

 absorption of uranous chloride in ethyl alcohol is very similar 

 to the absorption in methyl alcohol, as would be expected; 

 the methyl alcohol bands being of slightly shorter wave- 

 lengths. 



The absorption spectrum of uranous chloride in olycerol 



