SILVER, POTASSIUM, ETC. 15 



132.700 

 132.780 

 132.790 



Mean, 132.757, dr .019 



Turner's work* closely resembles that of Berzelius. Silver 

 was dissolved in nitric acid and precipitated as chloride. 

 In experiments one, two, and three the mixture was evapo- 

 rated and the residue fused. In experiment four the chlo- 

 ride was collected on a filter. A fifth experiment was 

 made, but has been rejected as worthless. 



The results were as follows : In a third column I put the 

 quantity of AgCl proportional to 100 parts of Ag. 



28.407 grains Ag gave 37-737 AgCl. 132.844 



41.917 " " 55-678 " 132.829 



40.006 " " 53143 *' 132.837 



30.922 " " 41.070 " 132.818 



Mean, 132.832, zh -0038 



The same general method of dissolving silver in nitric 

 acid, precipitating, evaporating, and fusing without transfer 

 of material was also adopted b} Penny.f 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 Marignact found that 100 parts of silver formed 

 132.74 of chloride, but gave no available details. Later,|| 



* Phil. Transactions, 1829, 291. 



t Phil. Transactions, 1839, 28. 



X Ann. Chem. Pharm., 44, 21. 



I See Berzelius' Lehrbuch, 5th Ed., Vol. 3, pp. 1192, 1193. 



