SILVER, POTASSIUM, ETC. 39 



28.407 grains Ag gave 37.737 AgCl. 132-844 



41.917 " 55-678 " 132-829 



40.006 " 53-143 " 132.837 



30.922 " 41.070 " 132.818 



Mean, 132.832, rb .0038 



The same general method of dissolving silver in nitric acid, precipi- 

 tating, evaporating, and fusing without transfer of material was also 

 adopted by Penny. * His results for 100 parts of silver are as follows, in 



parts of chloride : 



132.836 

 132.840 

 132.830 

 132.840 

 132.840 

 132.830 

 132.838 



Mean, 132.8363, dz .0012 



In 1842 Marignac t found that 100 parts of silver formed 132.74 of 

 chloride, but gave no available details. Later, X in another series of de- 

 terminations, he is more explicit, and gives the following data. The 

 weighings were reduced to a vacuum standard : 



79-853 gim. Ag gave 106.080 AgCl. 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, zb .0024 



The above series all represent the synthesis of silver chloride. Mau- 

 mene § 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, rh .0077 



By Dumas || we have the following estimations : 



9.954 Ag gave 13.227 AgCl. Ratio, 132. 8S2 

 19.976 " 26.542 " 132.869 



Mean, 132.8755, zh .0044 



*Phil. Transactions, 1839, 28. 



•(Ann. Chem. Pharm., 44, 21. 



J See Berzelins' Lehrbuch, 5th Ed., Vol. 3, pp. 1192, 1193. 



t Ann. d. Chim. et d. Phys. (3), 18, 49. 1S46. 



II Ann. Chem. Pharra., 113, 21. i85o. 



