hno3+h2so4

[arthur kierski]

does hno3+h2so4 dissolve gold?
i use this mixture to dissolve silver,copper and other base metals like iron from black chips before extracting gold with ar-------once or twice after extracting the silver from this mixture and doing a stanous test to it,the test gave a black result which created a doubt in my mind-----

 

[goldenchild]

Just out of curiosity. Why are you using nitric and sulfuric acid to dissolve silver and copper? The nitric will do this on its own.

 

[Anonymous]

Most likely since it takes less sulfuric, and having sulfuric will convert the coppernitrate to copper sulfate and nitric.

maybe you dissolved some palladium and that is giving a colored result.

Jim

 

[arthur kierski]

goldenchild,the material is very magnetic and nitric alone does not dissolve the iron totally.After dissolving the material with nitric ,the material left, continues magnetic--that is why i use sulfuric together with the nitric----by the way ,as i said in the thread only sometimes the using of stanous gives a black colour(maybe the iron)-as jim mentioned it might be pd