16 THE ATO:\riC WEIGHTS. 



in another series of determinations, he is more explicit, and 

 gives the following data : The weighings were reduced to 

 a vacuum standard. 



79.853 grm. Ag gave 106.080 AgCI. Ratio, 132.844 



69.905 " 92.864 " 132-843 



64.905 " 86.210 " 132.825 



92.362 " 122.693 " 132-839 



99.653 « 132.383 " 132.844 



Mean, 132.839, dr .0024 



The above series all represent the synthesis of silver chlo- 

 ride. Maumene* made analyses of the compound, reducing 

 it to metal in a current of hydrogen. His experiments 

 make 100 parts of silver equivalent to chloride : 



132.734 

 132.754 

 132.724 

 132.729 

 132.741 



Mean, 132.7364, ± .0077 



By Dumast we have the following estimations : 



9.954 Ag gave 13.227 AgCI. Ratio, 132.882 



19.976 " 26.542 " 132.869 



Mean, 132.8755, ± .0044 



Finally, there are seven determinations by Stas,| made 

 with his usual accuracy and with every precaution against 

 error. In the first, second, and third, silver was heated in 

 chlorine gas, and the synthesis of silver chloride thus 

 effected directly. In the fourth and fifth silver was dis- 

 solved in nitric acid, and the chloride thrown down by 

 passing hydrochloric acid gas over the surface of the solution. 

 The whole was then evaporated in the same vessel, and the 

 chloride fused, first in an atmosphere of hydrochloric acid, 



* Ann. d. Chim. et d. Phys., (3,) 18, 49. 1846. 

 f Ann. Chem. Phaim., 113, 21. i860. 

 J Aronstein's Translation, p. 171. 



