URANIUM SALTS. 



129 



An aqueous solution of uranous chloride in concentrated hydrochloric 

 acid gave the uranyl bands very distinctly. The uranium salt was reduced 

 in this case in the presence of hydrochloric acid. The spectrum is almost 

 identical with that of uranous chloride when hydrochloric acid is added 

 after the reduction has taken place. 



The addition of about 20 per cent strong sulphuric acid to an aqueous 

 solution of uranous and aluminium chlorides has a very marked effect upon 

 the bands. The general effect is to shift the bands towards the violet. 

 For the uranous chloride solution containing aluminium there is a band 

 about 50 Angstrom units wide at X 6770 and a band from X 6460 to X 6640. 

 These are the water-bands. When sulphuric acid is added there is a wide 

 band from X 6600 to X 6760, a narrow band at X 6480, and a wide band 

 running from X 6200 to X 6400. Sulphuric acid reverses the breadth of 

 the two red water-bands. 



The water-band at X 5500 is shifted to the violet and doubled by the 

 addition of H 2 S0 4 , the resulting bands being X 5500 (strong) and X 5400. 

 The uranyl bands are all shifted to the violet as follows: a, X 4990 to X 4890; 

 b, X 4780 to X 4750; c, X 4620 to X 4560; d, X 4400 (X 4490 weak) to X 4360; 

 e, X 4280 to X 4220; /, X 4140 to X 4080. 



Uranous Chloride in Water and Methyl Alcohol; Water and Acetic Acid; 

 Water and Nitric Acid; and in Water and Sulphuric Acid. 



Strip 1, Plate 98, B, is a 4 mm. depth of layer of a 0.17 normal aque- 

 ous solution of uranous chloride; strip 2 is the one to which the depth of 

 layer has been increased to 6.3 mm. by adding methyl alcohol; strip 3, 

 addition of methyl alcohol until depth of layer is 7.5 mm.; strip 4 is a 

 4 mm. 0.17 normal aqueous solution of uranous chloride; strip 5 is 4 to 

 which acetic acid has been added to make the depth of layer 28 mm.; 

 strip 6 is a 4 mm. 0.17 normal aqueous solution of uranous chloride + 2 

 mm. of strong nitric acid; strip 7 is a 4 mm. 0.17 normal aqueous solution 

 of uranous chloride to which 19 mm. of sulphuric acid had been added: 



Strip 1. 



4380 

 42S0 



4130 

 4875 



5520 



6340 

 6420-6620 



6755 



Methyl Alcohol. Strip3 



4255 



4670 (characteristic) 



5000 (very diffuse) 



/5250 (very diffuse) 

 \ 6200 (very diffuse) 



Acetic Acid. Strip 5. 



4785 



4620 



4450 



4280-4245 



4130/? 



4900-5000 



5500 (very diffuse) 



6450-6800 



HNOs. Strip 6. 



4330 e ? 

 4240/? 



4120 ff? 



4800 (very diffuse) 



5450 (very diffuse) 



6500(50 A. U. wide) 

 6670-6760 



H2SO4. Strip 7. 



4750 

 4550 

 4400 

 4340 

 4220 



4100 

 4900 



(very diffuse), 

 (very diffuse). 



(double narrow 

 component on 

 violet side). 



(wide and 



strong). 

 5390-5490 (almost 



join). 

 6250-6380 

 6490 (30 A.U.wide). 

 6610-6760 (quite well 



defined). 



Plate 90, A, strip 1, represents the absorption of a 1.8 mm. solution 

 of uranous chloride in acetone (a different solution from that previously 

 described and one which instead of having been freshly prepared had been 

 9 



