206 JONES-STRONG— THE ABSORPTION SPECTRA [April 24, 



alcohol bands of the salt decreased in intensity, but did not change 

 their position in the spectrum. At the same time the water bands 

 of the salt became more intense. In the present work it is shown 

 that the uranyl nitrate bands in pure water and in pure methyl 

 alcohol occupy different positions. The problem to be investigated 

 is to find out whether in mixtures of water and methyl alcohol, the 

 uranyl bands will show a gradual shift, or whether the methyl 

 alcohol uranyl bands and the water bands will both exist together; 

 their relative intensities being proportional to the relative amounts 

 of methyl alcohol and water. It was found that the two sets of 

 bands exist together and that the methyl alcohol bands decrease in 

 intensity quite rapidly with increase of water. The blue-violet 

 band showed marked changes until the amount of water reached 

 about 20 per cent. In this work the amount of uranyl nitrate in 

 the path of the light was kept constant, and the only variable was 

 the relative amounts of methyl alcohol and water. The above 

 would indicate that uranyl nitrate in water is " hydrated " and in 

 methyl alcohol it is " alcoholated." The above data indicate that 

 the effect of " hydration " is much more persistent than that of 

 " alcoholation." It is quite possible that this is due to a greater 

 number of water molecules producing the hydration than there is 

 methyl alcohol molecules taking part in alcoholation. 



(/) Uranyl Nitrate in Ethyl Alcohol. 



The absorption of uranyl nitrate in ethyl alcohol was mapped 

 and the general characteristics were found to be the same as for the 

 water and methyl alcohol solutions. A new band was found at 

 A 5200 which was about 50 Angstrom units wide. All the uranyl 

 bands were very faint and wide and therefore difficult to measure. 

 Beer's law showed deviations similar to those found for the methyl 

 alcohol solution. On account of the diffuseness of the bands no 

 spectrograms were made of mixtures of water and ethyl alcohol. 

 Following are approximately the positions of a few of the bands : 



3875 



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