URANIUM SALTS. 125 



The de band of the methyl alcohol solution X 4300 to X 4450 weakens and 

 breaks up, giving the d band at X 4400 and the e band at X 4280. This e 

 band is a broadened band otherwise similar in appearance to the band 

 X 4300 in methyl alcohol, which appears quite narrow. The methyl alcohol 

 bands /, X 4230, and g, X 4120, become the g water-band at X 4160, apparently 

 by coming together. 



The most important change produced by adding acetone to a methyl 

 alcohol solution of uranous chloride is to bring in a lot of narrow acetone 

 bands in the region X 6000 to X 6500, and the strong absorption band from 

 X 6500 to X 6800. There also appears a band at X 5600. 



Uranous Chloride in Water and Ethyl Alcohol. 



The addition of ethyl alcohol (spectrogram 96, A) to an aqueous 

 solution of uranous chloride causes a very marked change in the absorption 

 spectrum; the water-bands gradually disappearing being replaced by ethyl 

 alcohol bands. This spectrogram shows the decrease of intensity of the 

 water-bands very well. Strip 2 represents a 3.2 mm. depth of uranous 

 chloride in water; 3 the same to which 1.2 mm. of ethyl alcohol has been 

 added; 4 the same as 3 to which 2.2 mm. of ethyl alcohol has been added; 

 5 equals 4 + 6 mm. ethyl alcohol, 6 equals 5 + 10 mm. ethyl alcohol. The 

 upper strips are weak on account of the formation of a precipitate. 



Uranous Chloride in Acetone and Water. 



Plate 85, A and B, represents the absorption spectra of uranous 

 chloride in mixtures of acetone, A representing the more dilute solution of 

 uranous chloride. The lower strip represents the absorption of an almost 

 pure acetone solution, the other strips representing the absorption of the 

 same solution to which greater and greater amounts of water are added. 



This spectrogram shows that several of the uranyl bands are charac- 

 teristic of acetone and aqueous solutions. The absorption of an acetone 

 solution in the region X 6500 is much less and consists of but a single band. 

 The aqueous solution, on the other hand, has a very characteristic band 

 at X 6750. The band at X 5550 of the acetone solution is shifted towards 

 the violet as water is added. 



As the percentage of acetone is decreased the acetone bands a, X 4920, 

 b, X 4750, and c, X 4590, gradually disappear, while the water-bands a, 

 X 4980, b, X 4700, and c, X 4570, gradually increase in intensity. No shift is 

 to be noticed. 



The other uranyl bands appear but slightly changed; the positions 

 and intensities of the acetone and water-bands being about the same. For 

 the acetone solution they are de, X 4430, /, X 4290, g, XX 4160, 4130, h, XX 4040, 

 4010, and i, X 3910. For the aqueous solution they are de, a 4450 (weak), 

 /, X 4290, g, X 4150, and h, X 4010. 



Uranous Chloride in Methyl and Ethyl Alcohols. 



In Plate 88, A represents the absorption of a dilute solution of uranous 

 chloride in ethyl alcohol, and B in methyl alcohol. The depths of cell 

 were 3, 6, 12, 24, and 35 mm., slit-width 0.15 mm., exposure to Nernst glower 



