t^RETENDED NEW METAL; PALLADIUM. 177 



bring the examples of anomalous precipitations, in mixed fo- green fulphate 

 Jutions of the metals, more clearly Into view> it will be ne-^ 'J^°"» *^ "' 

 cefTary to ftate the adion of thefe falts, upon a folution of 

 each metal when feparate. 



By recent muriate of tin we have, with a folution of ^old, Action of the 

 the well known purple of Caffius. With platina, the coldiirof tj^oj^ ^1^, 

 of the liquor is much heightened. With mercury, there is a tions of gold, 

 total reduction. .With copper, a reduction from the black ^^^^y"^^'^"^"^^ 

 oxide at 20 per cent, of oxigen, to the yellow oxide at 1 1 ,5 arienic acid, 

 per cent, of oxigen. With arfenic acid, a redudion to the,^!^^^''' '^^'^» *"' 



... . . . tirnony. 



ftate of white oxide. With filver, with lead, with antimony, 



no redudion. Green fulphate of iron reduces none of theof green fulpbate 



metallic folutions, except thofe of gold and filven ti on of gold and 



Wiien mixed folutions of the metals are expofed to the filver oniy. 

 a6lion of recent muriate of tin, or of green fulphate of iron, 

 we have the following refulls. 



Bxperiments 4, 5, 6, 7, and 8. Muriate of tin, poured into Exp. with mixed 

 a mixed folution of gold and mercury, precipitates both metals ^^^ ^ ^^ ^.'j^ ^^ 

 together; and there are no traces of the purple. Mixed fo- reagent, 

 lutions of gold and antimony, alfo of gold and arfenic acid, 

 are a6led upon in the fame manner. Mixed folutions of gold 

 and copper, alfo of gold and lead, afford refults fimilar to 

 thofe of each metal when feparate. 



Experiments 9, 10, 11, 12, and 13. With a folution of platina 

 and arfenic acid, muriate of tin gives no precipitate; but the 

 colour of the liquor is more heightened than if the platina had 

 been alone in folution. Platina and antimony give a precipitate 

 by this re-agent, after ftanding fome>time ; but the efFed is re- 

 tarded by the excefs of acid in the folution of antimony. Pla- 

 tina and copper, alfo platina and lead, are aded upon as the 

 feparate folutions of thefe metals. Platina and filver are 

 precipitated together by green fulphate of iron. Green fulphate 



Experiments 14, 15, 16. Mercury and copper, mercury arid 

 lead, alfo mercury and arfenic, are precipitated in the metallic 

 ftate by recent muriate of tin. ^ 



From thefe experiments it is evident, 



Ift. That gold has an affinity for mercury, for antimony Deduaiorsof 

 and for arfenic. ' ^^f tlT"" 



gold and mcr- 



2d. That platina has an affinity for filver, for mercury, and cury, antimony, 

 for antimony: and that it is influenced by the prefence of*'"^^"l^'P^^'^'"* 

 arlenic. cury, antimony} 



3d. That filver has an affinity for mercury. f»Jver and mer- 



Vol. VII.~March, 1804. N ^^* Th^^Z\l^^^\Z, 



arfeni^ 



