Rhodium precipitate

[Riyoso]

Can anyone tell me how to precipitate rhodium out
of a 96 % sulfuric acid selution contained from
a honey comb in cats? The same honey combs
were also in a ar selution for 3 days i droped out
any values with scrap alluminium and got a black
precipitate but dont know what it is but does not
disolve in any acid.I would appreciate any
comments.


Riyoso

 

[Lou]

Zinc will precipitate rhodium from sulfuric acid solution.

 

[Irons]

Zinc will precipitate rhodium from sulfuric acid solution.

It will take an awful excess of Zinc from 96% H2SO4 and probably a hazmat cleanup crew from the resulting violent reaction.

 

[Riyoso]

So what would you suggest i do Irions ?

 

[ps_jb]

So what would you suggest i do Irions ?

First, neutralize the solution with NaHCO3 - then use either Zn or hydrazine.
Hydrazine is very powerful reduction agent - so be sure that there is no any base metals, like copper, iron etc in your solution

 

[Lou]

Sorry, guess I should be more clear.


Zinc will precipitate rhodium from a sulfuric acid solution.

Which means dilute it down. Then you can adjust the pH to 3-4 with a suitable base, like NaOH (carbonate also works, but it's also prone to foamover every bit as much as zinc dissolution is).

Avoid hydrazine until all else fails.

 

[Riyoso]

Thanks ill try it out and see how it works.

 

[Irons]

Sorry, guess I should be more clear.


Zinc will precipitate rhodium from a sulfuric acid solution.

Which means dilute it down. Then you can adjust the pH to 3-4 with a suitable base, like NaOH (carbonate also works, but it's also prone to foamover every bit as much as zinc dissolution is).

Avoid hydrazine until all else fails.

One reason that I have become cautious in making suggestions is that in the beginning, I assumed that the board members had basic chemistry skills and understood the ramifications.
Obviously, even I don't always understand the consequences of trying to work with elements which don't like to go into solution, as you well know.

So, now I keep my mouth shut, except in cases where there might be a misunderstanding.

Not to be critical of Lou, his understanding of Chemistry exceeds mine by a long shot.

 

[markqf1]

Mmmm,
Basic chemistry skills?

I think I went to school with a guy that had a pair of those.


Mark

 

[heliyaum]

Sorry, guess I should be more clear.


Zinc will precipitate rhodium from a sulfuric acid solution.

Which means dilute it down. Then you can adjust the pH to 3-4 with a suitable base, like NaOH (carbonate also works, but it's also prone to foamover every bit as much as zinc dissolution is).

Avoid hydrazine until all else fails.

Thank you for details.
Can you help me with instruction of rhodium reviving by formaldehyde?
Of course it is applied with ammonia solution, not zinc.

 

[Yggdrasil]

Thank you for details.
Can you help me with instruction of rhodium reviving by formaldehyde?
Of course it is applied with ammonia solution, not zinc.

What do you mean with reviving?
Do you mean convert to metal, precipitate or something else?

 

[heliyaum]

What do you mean with reviving?
Do you mean convert to metal, precipitate or something else?

I meant converting to metal.

 

[Yggdrasil]

I meant converting to metal.

What is the source of the Rhodium?
Is the solution clean for other metals?
Why do you want to use formaldehyde?