

Bosworth— 



Ioclorae 



trie DeU 



nomination of Silt 



er. 289 









Table 



II. 









KHoAsOs added 



I 2 



used 









t ' 





, 



j- v 





Error 



Silver 





Silver 





Silver 



Silver 



in terms of 



taken 





value 





value 



found 



silver 



grin. 



cin 3 . 



grm. 



cm 3 . 

 A 

 n carried < 



grm. 



grm. 



grm. 



Use of NH 4 OH. 



Titratio 



m in presence of the precipitate 



0-1054 



20 



0-2000 



8-55 



0-0952 



0-1048 



— 0-0006 



0-1054 



20 



0-2000 



8-50 



0-0946 



0*1054 



±0-0000 



0-1054 



28 



0-2300 



11-28 



0-1256 



0-1044 



— o-ooio 



0-1054 



20 



0-2000 



8-45 



0-0941 



0-1059 



+ 0-0005 



0'1054 



20 



0-2000 



8-48 



0-0944 



0-1056 



+ 0-0002 



Use of 



NaHC0 3 



x> 



Titration carried 



on in presence of the 



precipitate 



0-1054 



18 



0-1800 



6-80 



0-0757 



0-1043 



—o-ooii 



0*1054 



17 



0-1700 



5-81 



0-0647 



0-1053 



-o-oooi 



0-1054 



15 



0-1500 



4-00 



0-0445 



0-1055 



+ 0-0001 



0-1054 



21 



0-2100 



9-45 



0-1052 



0-1048 



-0-0006 



0-1054 



25 



0-2500 



13-00 



0-1447 



0-1053 



— 0-0001 



0-1054 



31 



0-3100 



18-40 

 C 

 of NaNO 



0-2048 



0-1052 



— 0-0002 



Use of NaHCOs. 



2 grins. 



j present. 



Titration carried on in 







presence of precipitate 







0*0949 



21 



0-2100 



10-42 



0-1160 



0-0940 



— 0-0009 



0-1054 



21 



0-2100 



9-43 



0-1050 



0-1050 



— 0-0004 



0-1265 



20 



0-2000 



6-60 



0-0735 



0-1265 



+ 0-0000 



0-1686 



21 



0-2100 



3-80 



0-0432 



0-1678 



— 0-0008 



0-1054 



15 



0-1500 



4-08 



0-0454 



0-1046 



— 0-0008 



tions were made according to the following plan, the details of 

 the experiments being given in Table III, A. From a known 

 amount of a standard solution the silver was precipitated with 

 hydrochloric acid, and filtered upon asbestos. The precipitate 

 was then acted upon by strong ammonia, the mixture being- 

 allowed to stand until the silver chloride was completely dis- 

 solved. The solution was diluted to 100 cm3 and reduction 

 accomplished by adding an excess of standard potassium 

 arsenite, and boiling the resulting solution. The excess of 

 potassium arsenite was subsequently titrated according to the 

 procedure outlined previously in this paper. In Table III, B, 

 are details of determinations similarly made, in which the 

 silver was separated from 0-09 grm. of copper. The experi- 

 ments in Table III, C, illustrate the separation of silver from 

 # 2 grm. of lead, and in the experiment recorded in D the 

 silver was precipitated from a solution containing 0*09 grm. of 

 copper and 0'2 grm. of lead. 



From the results recorded in this paper, it is evident that 

 silver can be easilv and accuratelv estimated, either in solution 



