Sciencemadness Discussion Board

A METAL INDISSOLUBLE IN...

pneumatician - 19-8-2015 at 20:38

NITRIC
HCL
SULFURIC
AQUA REGIA

EXIST??????????? if yes or no what uses for this metal???? (beyond the tipical uses of electric contacts in computers, photocameras...)

kecskesajt - 19-8-2015 at 23:43

Ruthenium.It doesnt dissolve in aqua regia.But it dissolves in... House hold bleach :P
Nurdrage have a video about it.

fluorescence - 19-8-2015 at 23:45

I think Ruthenium is pretty inert towards Aqua Regia and probably to the rest of these, too.
But there is always something that will attack a metal. There is also a difference between
beeing attacked by an acid an really dissolving in it. If you think about fluorine containers.
They would react witht elemental fluorine but as soon as they do they build up a layer of fluoride
that protects the metal under it.

Edit: kecskesajt was faster :D

[Edited on 20-8-2015 by fluorescence]

BromicAcid - 20-8-2015 at 03:30

In terms of alloys, two 'common' choices: Elgiloy (Possibly) or Inconel (best). Even Hastelloy C the normal go-to does not hold up to that range. Check out this compatibility chart:

www.balseal.com/sites/default/files/tr60c_020707132612.pdf

kecskesajt - 20-8-2015 at 03:32

Quote: Originally posted by fluorescence  
I think Ruthenium is pretty inert towards Aqua Regia and probably to the rest of these, too.
But there is always something that will attack a metal. There is also a difference between
beeing attacked by an acid an really dissolving in it. If you think about fluorine containers.
They would react witht elemental fluorine but as soon as they do they build up a layer of fluoride
that protects the metal under it.

Edit: kecskesajt was faster :D

[Edited on 20-8-2015 by fluorescence]

2 minutes faster.
Its like:You start to write a comment on 09:42,but you dont see I post it on 09:43 and it takes 3 mins to write.
Happens me quite a lot time.

ave369 - 20-8-2015 at 05:32

Tungsten. Very slowly reacts with aqua regia, sulfuric and hydrochloric acids as bulk metal. Powdered tungsten is somewhat more active.

Mabus - 20-8-2015 at 05:59

Iridium.

aga - 20-8-2015 at 11:11

i'm still wondering what 'indissoluble' means.

battoussai114 - 20-8-2015 at 16:18

Niobium and , I think, tantalum can withstand attack from acqua regia.

diddi - 20-8-2015 at 17:52

I have dissolved Ru in hypochlorite, but it is slow and produces a black insoluble material. I don't know of any other ways of getting it to dissolve, though.

Have not tried any of the refractory metals in acids yet, but I would not expect much reactivity.

BromicAcid - 20-8-2015 at 18:54

Quote: Originally posted by aga  
i'm still wondering what 'indissoluble' means.


Portmanteau between insoluble and indivisible?

pneumatician - 21-8-2015 at 15:46


what is "indissoluble"
http://www.thefreedictionary.com/indissoluble

thanks I checked your suggestions, here is a result, I rated from 1-10 the resistence to acids, aqua regia... and of course things less corrosive like air, water...

Ruthenium -> 2 “oxidizes explosively”
Tungsten -> 6 but warm aqua regia eats
http://www.tungsten.com/chemical-resistance-of-tungsten/
Iridium -> 7 but “attacked by molten salts, such as NaCl and NaCN.”
http://periodic.lanl.gov/77.shtml
Niobium -> 0 react with air!!!
http://periodic.lanl.gov/60.shtml
Tantalum -> 4 good promise but ataked by sulfur trioxide, in Beijing, Mexico D. F... this metal is like an ice cube in Sahara :D
http://periodic.lanl.gov/73.shtml

Elgiloy
Inconel
Hastelloy C

alloys
Under aqua regia the resistence is “acceptable” :)

so maybe the "best" is rhodium

http://goldrefiningforum.com/~goldrefi/phpBB3/viewtopic.php?...

aga - 21-8-2015 at 16:33

Woo ! It is actually a word.

Thankyou for that. I had never heard of that word, ever.

Why do you want a metal that will not be touched by aqua regia ?

Are you making a Giant Gold refinery ?

battoussai114 - 22-8-2015 at 09:51

Actually, that would be Neodimyiun (Nd). While Niobium will also oxidize in air, it only happens around 200C, and while it does tolerate the acids and oxidizing acid mixtures, like acqua regia, it can't handle fluoride ions, so HF and its mixes as well as any possibly acidified fluorine salt will wreak havoc.

pneumatician - 3-9-2015 at 06:09

Quote: Originally posted by aga  
Woo ! It is actually a word.

Thankyou for that. I had never heard of that word, ever.


:)
Quote: Originally posted by aga  
Why do you want a metal that will not be touched by aqua regia ?

Are you making a Giant Gold refinery ?


no of course is for a comic.

aga - 3-9-2015 at 10:48

Easy: Kryptonium