124 



A STUDY OF THE ABSORPTION SPECTRA. 



Two cubic centimeters of a normal aqueous solution of uranyl chloride 

 were added to 8 c.c. of a 3.04 normal aqueous solution of aluminium chlo- 

 ride and to this were added 2 c.c. of hydrochloric acid and zinc, so that the 

 uran3 r l salt was reduced to the uranous condition. To a 2 mm. depth of 

 solution was added water so as to make the depth of cell 7 mm. The addi- 

 tion of water caused the b, c, d, and e bands to become very faint and 

 to be shifted to the violet. The band at X 4980 and especially the bands at 

 X 5500, X 6500, and X 6750 were very considerably shifted. The solution of 

 7 mm. thickness showed bands at XX 4130, 4210 (narrow), 4285, 4420(?). 



Uranous Chloride in Hydrochloric Acid and Acetone. 



A 0.2 normal solution of uranyl chloride in strong hydrochloric acid was 

 reduced by using as little zinc as possible. Plate 70, A, shows the absorption 

 spectra of this solution to which acetone has been added. Strip 1 repre- 

 sents the absorption of 5 mm. of the hydrochloric acid solution; strip 2 the 

 same to which 1 mm. of acetone has been added; strip 3, 3.3 mm. acetone, 

 and strip 4, 12 mm. of acetone. The solution was thoroughly mixed in 

 each case. 



In strip 1, a consists of a strong broad band. As acetone is added this 

 breaks into two components; the longer wave-length component disappear- 

 ing as more and more acetone is added. In strip 1 the d band has a very 

 diffuse band near it on the long wave-length side. In addition to the 

 uranyl bands there is a broad band at X 5550; one from X 6450 to X 6680 

 and from X 6720 to X 6820. In strip 4 all the broad uranous bands have 

 disappeared and there remain only fine bands from 10 to 20 Angstrom 

 units wide. These are located at XX 6780, 6740, 6690, 6625, 6600, 6555, 

 6490, 6470, 6040, 6000, 5960, 5910, 5220, 5210, and 5195. 



Uranous Chloride in Mixtures op Methyl Alcohol and Water and op Methyl 



Alcohol and Acetone. 



Plate 89, A and B, represents the absorption spectra of a constant 

 amount of uranous chloride in mixtures of methyl alcohol and water (A); 

 and of mixtures of methyl alcohol and acetone (B); the lower strip repre- 

 senting the methyl alcohol solution. 



As the amount of water increases the water-band X 6750 comes out 

 gradually. The methyl alcohol band X 5050 to X 4850 is probably double. 

 This narrows on the red side into a band at X 4850. The methyl alcohol 

 bands X 4770 and X 4600 practically disappear, and the band X 4670 becomes 

 very weak. In their places appear the water-bands X 4700 and X 4550. 



