1909] OF VARIOUS SALTS IN SOLUTION. 213 ' 



(/) Absorption Spectrum of Uranyl Chloride and Calcium Chloride 

 in Methyl Alcohol. 



In the solution of uranyl chloride in methyl alcohol the d and e 

 bands are very diffuse, but are entirely separate. By adding cal- 

 cium chloride a very peculiar phenomenon takes place. The d and e 

 bands come together and as far as one can tell form a single band. 

 At the same time the /, g and h bands shift to the red. For a solu- 

 tion containing a .9 normal solution of calcium chloride one finds 

 that the b and c bands have practically remained in the same posi- 

 tion, the d and e bands have merged into one and the /, g, h bands 

 have moved to approximately AA4260, 4120 and 4010 respectively. 

 The de band is approximately at A 4420. 



{g) Absorption Spectrum of Uranyl Chloride in Methyl Alcohol 



and Water. 



A spectrogram was made of a solution of uranyl chloride of con- 

 stant concentration in mixtures of methyl alcohol and water. A 

 small addition of water causes a considerable decrease in the absorp- 

 tion power of the uranyl chloride. When the amount of water has 

 reached about 16 per cent, very little further change is produced by 

 further increasing the amount of water. The most important effect 

 of the addition of water is the effect upon the uranyl bands. For a 

 pure alcoholic solution the a and b bands appear ; the b band being 

 quite intense. Adding water causes a and b to both decrease in 

 intensity and apparently to shift towards the violet. A spectrogram 

 of smaller concentration shows the a, b, c, f, g, h and i bands ; the 

 solution containing 8 per cent, water the b, c, d, e, f, g, h, i and / 

 bands ; the 16 per cent, water solution b, c, d, e, f, g, h, i and /; the 

 24 per cent, aqueous solution shows all these bands greatly weak- 

 ened, and in solutions containing a greater amount of water prac- 

 tically only the b and c bands appear, and these are very diffuse. 

 The general effect upon the positions of the bands is quite remark- 

 able, the b and c bands apparently being shifted to the violet with 

 increase of water, whereas the ultra-violet bands appear to be 

 shifted towards the red. 



