LITHIUM. 75 



Mg = 24 ; Na = 23. The sulphate was prepared from car- 

 bonate, and dried somewhat below a red heat. [SUliman's 

 Amer. Journ., (2,) S8, 1859, 349.) 



K DiEHL : 7.026 (0 = 16). 



Determined by analysis of lithium carbonate with Bun- 

 een's apparatus and in his laboratory. Four experiments ; 

 extreme difference, 0.024. C = 12. The salt was purified 

 from alkalis by precipitation as carbonate, resolution in acid 

 and reprecipitation, repeated until the sodium line was no 

 longer visible. Diehl found that precipitation of the sul- 

 phate with barium chloride gave a nearly constant error on 

 account of the retention of lithium in the precipitate, and 

 led to nearly the same results as Berzelius got. [Liebig's 

 Ann., mi, 1862, 93.) 



L. Troost : 7 (O = 16). 



Troost found 1.309 grammes lithium chloride = 4.42 

 argentic chloride, and 2.75 lithium chloride = 9.3 argentic 

 chloride. From these analyses he deduces the values 7.03 

 and 6.99. By decomposing the carbonate, dried at 100°, 

 with silicic acid, he found 0.97 carbonate = 0.577 carbon 

 di-oxide and 1.782 carbonate = 1.059 di-oxide, and infers 

 for Li 7 and 7.02. In one experiment the carbonate was 

 converted into sulphate. 1.217 carbonate gave 1.808 sul- 

 phate. Troost calculates Li = 7.06. [If CI = 35.457 ; Ag 

 = 107.93; C=:12; S=:32; these determinations give, in 

 the same order as above, 7.01; 6.94; 6.98; 7.02; 7.07.] 

 The carbonate was purified by solution in water containing 

 carbon di-oxide, and reprecipitation by boiling, the opera- 

 tion being repeated until the salt was spectroscopically pure. 

 {Paris Comptes Rend., 5/,., 1862, 366.) 



J. S. Stas : 7.022 (0 = 16). 



According to the mean of three determinations, 100 parts 

 of silver =: 39.358 lithium chloride; extreme diff'erence, 

 0.005. If Ag = 107.93; 01 = 35.457; this ratio gives Li 

 =: 7.022. This value is confirmed by experiments on the 

 conversion of the chloride into the nitrate, the results of 

 which give Li =: 7.018. The comparison with silver was 

 made according to Pelouze's modification of the silver titra- 

 tion method. The chloride was purified from alkalis, after 

 preliminary treatment with ether and alcohol, by pouring 

 the dissolved salt into a boiling solution of ammonium car- 



