LITHIUM. 73 



atomic weight of silver. The drying of the nitrate could 

 be accomplished only in vacuo and at about 155°. The 

 weighings are for vacuum. The lead used was prepared 

 from commercial acetate by precipitation with metallic lead, 

 of copper, etc., conversion into sulphate, then into carbo- 

 nate and reduction by potassic cyanide or black flux. [Stas, 

 Untersuch. ilher Chem. Prop. Leipzig^ 1867, 324.) 



LITHIUM. 



Regnault has determined the specific heat of lithium. It 

 corresponds to an atomic weight of about 7. ( Gmelin- 

 Kraut, I. c.) 



The earliest determinations of this constant seem to 

 have been made with a double salt of lithium and potassium, 

 at all events with a very impure material. According to 

 Arfvedson, 420.4 lithium chloride give 1322.4 argentic 

 chloride, whence he deduces as the atomic weight the num- 

 ber 127.757 [or 10.22.] [Poggend. Ann., 8, 1826, 189.) L. 

 X. Vauqueliii found 430 lithium sulphate equivalent to 

 875 barium sulphate. [If S i= 32; Ba = 137.08, this rela- 

 tion gives Li = 9.27.] Vauquelin does not describe the 

 preparation of his salt. {Annal. de Chem. et de Phgs., 7, 1818, 

 287.) C. G. Gmelin found Li = 191.21 [or 7.65.] {Poggend. 

 Ann., 15, 480 ; Gilbert's Ann., 62, 1819, 399.) Kralovanszky 

 by two analyses of the sulphate with barium chloride jyot 

 Li at from 10.096 to 10.168 {Liehig's Ann., 121, 94; 

 Schweigger's Journ., S4, 1828, 231.) Thomson and Stro- 

 meyer also each got similar values. [Thomson's System of 

 Chem., 7th ed., 1, 1831, 420.) 



R. Hermann : 6.085 (O = 16) ; 38.03 (O = 100). 



Experiments were made on the carbonate by decomposing 

 it with acid over mercury, and measuring the resultant 

 di-oxide. For C = 75.33, these determinations give Li = 

 38. Several experiments were also made by analyzing the 

 sulphate with barium chloride. For S = 201.06 and Ba = 

 856.88, these give Li =: 38.05. liermann precipitated 

 lithium carbonate with ammonium carbonate, and subse- 

 quently converted it into sulphate. The chloride was pre- 

 pared from the phosphate by Berzelius' method. {Poggend, 

 Ann., 15, 1829, 480.) 



