On the Lead-Zinc and Bismuth-Zinc Alloys. 



319 



solved in nitric acid, diluted with water, and the bismuth precipitated 

 by ammonia and carbonate of ammonia. The bismuth was filtered 

 off and washed with a mixture of 10 parts water, 2 of ammonia, and 

 1 of carbonate of ammonia. The nitrate was mixed with carbonate 

 of soda in excess, and evaporated down on a water-bath in a platinum 

 dish ; when dry, it was moistened with water and again evaporated to 

 dryness in order to drive off the last traces of ammoniacal salts. 

 The dry mass was then washed into a beaker, made slightly acid, 

 boiled, and whilst boiling precipitated by carbonate of soda : the zinc 

 was weighed as oxide. 



The Zinc-end. — About 12 grms. were taken, the zinc partly dis- 

 solved out by dilute hydrochloric acid, the residue dissolved in nitric 

 acid, and precipitated by ammonia and carbonate of ammonia : the 

 bismuth was weighed as oxide. 



Analyses of the Bismuth-zinc Alloys. 



Bismuth 50 per cent., and zinc 50 per cent. 



Taken. 



Zinc-end 15*520 grms. 



Zinc-end 13-990 „ 



Bismuth-end 8-000 „ 



Found. 



Per-centaere. 



0-420 Bi03 

 0-386 „ 

 1-385 „ 



2-42 Bi 



2-48 „ 

 13-85 Zn 



Bismuth 50 per cent., and zinc 50 per cent. 



Zinc-end 14-2042 grms. 



■Bismuth-end ... 3-5060 ,, 



0-3784 BiOS 

 0-3795 ZnO 



2-39 Bi 

 8-65 Zn 



Bismuth 80 per cent., and zinc 20 per cent. 



Top 2-990 grms. 



*Top 3-0096 



Bottom 3-694 



^Bottom 2-9758 









525 



ZnO 







5295 



>> 







597 



>> 



0-4S85 



ij 



14-0 Zn 

 14-1 „ 

 12-93 „ 

 13-1 „ 



Bismuth 80 per cent., and zinc 20 per cent. 



*Top 2-5542 grms. 



*Bottom 2*5356 ,, 



0-5208 ZnO 

 0-4206 „ 



16-3 Zn 

 13-3 „ 



Bismuth 80 per cent., and zinc 20 per cent. 



♦Top 2-5778 grms, 



*Bottom 2-5757 „ 



0-4548 ZnO 

 0-2830 „ 



14-1 Zn 



8-8 „ 



Bismuth 5 per cent., and zinc 95 per cent. 



Top 13-230 grms. 



Bottom 16-050 „ 



0-351 BiO 3 

 0*430 „ 



2-38 Bi 

 2*40 „ 



From the foregoing analyses, it appears that lead will, under the 

 conditions detailed above, dissolve only 1*6 per cent, zinc, and zinc 

 1*2 per cent, lead ; that zinc will only dissolve 2*4 per cent, bismuth, 

 and bismuth 8"6-14*3 per cent. zinc. 



