SILVER. 109 



products of decomposition were passed over cupric oxide, 

 and through drying tubes and potash tubes. In five experi- 

 ments the acetate was treated in the same way, but not 

 mixed with sand. The mean result was Ag = 1350.32 ; 

 extreme dift'erence 0.77. Maumene found it very difficult 

 to purify the oxalate, which showed traces of nitric acid 

 after 100 washings. {Aiinal. de Chim. ei de Phys., (3,) 18, 

 1846, 41.) 



J. S. Stas : 107.93 (0 = 16). 



Thirteen syntlreses of argentic iodide, performed by 

 bringing hydroiodic acid in contact with argentic sulphate 

 or nitrate, gave 100 Ag= 117.5343 iodine. Three analyses 

 of argentic iodate, performed by decomposition by heat in 

 a current of nitrogen or by reduction of the salt, while in 

 suspension, by a current of sulphurous anhydride, gave 

 Agl = 284.779. Hence Ag = 107.928. Four syntheses of 

 the bromide, performed by bringing hydrobromic acid in 

 contact with argentic sulphate, gave 100 Ag = 74.0805 Br. 

 Two analyses of argentic bromate, by reduction while in 

 suspension with sulphurous anhydride, gave Ag Br = 

 187.87. Hence, Ag = 107.921. Seven syntheses of argen- 

 tic chloride, three of them by combustion of silver in chlo- 

 rine, three by precipitation with HCl, and one by precipita- 

 tion with ammonium chloride, gave 100 Ag = 32.8445 CI. 

 Stas adopts the number 32.85 on the supposition that no 

 excess of chlorine was possible. The chloride was fused. 

 Two analyses of the chlorate, accomplished by heat or by 

 evaporation with chlorhydric acid, gave Ag CI = 143.395. 

 Hence Ag = 107.937. Five syntheses of the sulphide, per- 

 formed by heating silver in a current of sulphur vapor, or 

 of hydrogen sulphide, gave 100 Ag =: 114.8522 argentic 

 sulphide. Six analyses of the sulphate by reduction in a 

 current of hydrogen, showed that 100 sulphate contained 

 69.203 silver, hence Ag =107.920, [107.926 ? vide Sulphur.] 

 From analysis of potassium chlorate, Stas had determined 

 the molecular weight of KCl at 74.59. By twenty-four 

 determinations he found 100 Ag = 69.103 KCl, hence 

 Ag =: 107.943. The silver was prepared either by Levol's 

 method or b}' decomposing an ammoniacal solution of 

 argentic nitrate with a mixture of ammonium sulphite and 

 a copper salt. The metal was heated to the boiling point 

 until the sodium line disappeared and the metallic fumes 

 were a pale blue. To test its purity, it was compared with 

 distilled silver. See Stas's determinations of CI, Br, I, S, 



