SILVER, POTASSIUM, ETC. 



39 



28.407 grains Ag gave 37.737 

 41.917 " 55-678 



40.006 " 53.143 



30.922 " 41.070 



132.844 

 132.829 

 '32.837 

 132.818 



Mean, 132.832, ^ .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, .0012 



In 1842 Marignacf found that 100 parts of silver formed 132.74 of 

 chloride, but gave no available details. Later, $ 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 grm. Ag gave 106.080 AgCl. 



69.905 " 92.864 " 



64.905 " 86.210 " 



92.362 " 122.693 " 



99.653 " 132.383 " 



Ratio, 132.844 



132-843 

 132.825 

 132.839 

 132.844 



Mean, 132.839, .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 



By Dumas 



Mean, 132.7364, =b .0077 



we have the following estimations : 



9.954 Ag gave 13.227 AgCl. Ratio, 132.882 



19.976 



26.542 



132.869 

 Mean, 132.8755, .0044 



*Phil. Transactions, 1839, 28. 



iAnn. Chetn. Pharm., 44, 21. 



I See Berzelius' I^ehrbuch, sth Ed., Vol. 3, pp. 1192, 1193. 



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



|| Ann. Chem. Pharm., 113, 21. 1860. 



