108 ATOMIC WEIGHT DETERMINATIONS. 



C. Marignac : 107 M2 (0 = 16) ; 674.505 (0 = 100). 



Marignac redetermined the relation between silver and 

 potassic chloride by Pelouze's method. He found 100 Ag 

 = 69.062 KCl in six experiments, the extreme difterence 

 between which was 0.018. In five experiments he found 

 100 KCl = 192.848 Ag; extreme difierence 0.04. He also 

 redetermined the composition of argentic chloride. The 

 silver was dissolved in a long-necked flask and the fumes 

 passed into a second flask containing water. Solution being 

 effected, the water from the second flask was added to the 

 contents of the first, and the whole precipitated with HCL 

 The chloride w^as washed, dried, melted and weighed in the 

 same flask. The result was 100 Ag = 132.84 chloride ; 

 extreme difterence 0.019. Combination of these data with 

 Marignac's old value for the molecular weight of KCl, 

 932.14, gives Ag = 1349.01. All weighings reduced to 

 vacuum. Berzelius revised the result by thi^owing out one 

 experiment and by rejecting the correction for vacuum. 

 He thus got Ag = 1349.66. {Berzelius^ Jahresbericht, 24-y 

 58; 25, 31 ; BibL Univ. de Geneve, 46, 1842, 350.) 



In opposition to Prout's hypothesis, Marignac cites his 

 analyses of argentic acetate, in which the escaping gases 

 were forced to pass over porous silver. They gave in three 

 experiments 64.664 silver from 100 acetate; extreme dif- 

 ference 0.005. If C = 75, this gives Ag = 1349.6. He 

 also found 100 Ag = 157.455 nitrate. [If IST = 87.5, this 

 gives Ag = 1348.88.] He also found 100 Ag = 49.556 

 ammonium chloride. [Liebig's Ann., 59, 284; Bibl. Univ. 

 de Geneve, 1846.) 



LiEBiG and Eedtenbacher ; Strecker : 107.903 (O 

 = 16) ; 674.395 (O = 100). 



Strecker recalculated Liebig and Redtenbacher's analyses 

 of argentic acetate, tartrate, racemate and malate by the 

 method of least squares, and from the difference in the 

 atomic composition of these salts. He obtained for Ag the 

 value 1348.79. Vide Carbon. {Liebig's Ann., 59, 1846,^280.) 



E. J. Maumene: 108.026 (0 = 16); 675.16 (0 = 

 100). 



In four experiments argentic oxalate was mixed with sand 

 in a flask and decomposed by heat in a current of air. The 



