Naked Science Forum
Non Life Sciences => Chemistry => Topic started by: Dr.IC on 11/03/2009 08:49:22
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Does Sulphuric acid reacts with gold wire.
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No.
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Which acid is preferable for the reaction, i want to see corrosion on the wire.
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So far as I'm aware, no acid or alkali reacts with pure gold. I could be wrong though. If it does, then the gold was not pure and the reaction is with the impurities rather than the gold.
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Which acid is preferable for the reaction, i want to see corrosion on the wire.
Aqua regia:
http://en.wikipedia.org/wiki/Aqua_regia
Another way: cianide (ex. KCN) in presence of air oxygen, or another oxidant, ex. H2O2; in this second way (the reaction is called "bombing" in gold laboratories/firms) you MUST use a totally closed hood with tubes to put hands, because CN- can also be oxidized to (CN)2 which can kill you in a few seconds.
Instead of Aqua_regia you can also use HCl + H2O2 (it makes Cl2) but it's slightly less effective. In both cases you have to heat up a little.
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I have read, but never bothered to verify, that telluric acid dissolves gold.
However, if I wanted to dissolve gold I would use HCl/HNO3.
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I have read, but never bothered to verify, that telluric acid dissolves gold.
However, if I wanted to dissolve gold I would use HCl/HNO3.
It should be Selenic acid:
http://pubs.acs.org/doi/abs/10.1021/ja01995a007
http://en.wikipedia.org/wiki/Selenic_acid
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How about nitric acid? does this work.
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How about nitric acid? does this work.
No, you need a complexant together with the oxidant (es. Cl- ions)
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We make rings out of gold ewe know !
ewe can buy one off me and then conduct your tests ?..
..see how I try to help ?
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I have enough of gold wire to conduct tests....... if i am in short i will send u a message...
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I have read, but never bothered to verify, that telluric acid dissolves gold.
However, if I wanted to dissolve gold I would use HCl/HNO3.
It should be Selenic acid:
http://pubs.acs.org/doi/abs/10.1021/ja01995a007
http://en.wikipedia.org/wiki/Selenic_acid
OOps, sorry, wrong group VI element.
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No,, But can't say ... under drastic condition it can change
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No,, But can't say ... under drastic condition it can change
what can change?
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The fact that gold does react with sulphuric acid under drastic conditions?
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The fact that gold does react with sulphuric acid under drastic conditions?
Ah, I believed he answered BC... [:)]
No, sulphuric acid cannot react with gold, even under drastic conditions; the acid is not complexant.
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Ohh u mean gold doesn't react with sulfuric acid...
It's not true...
But it reacts on some how.
The reaction of sub-ppm amounts of SO2 and NO2 in dry and humid air on a gold foil was studied using a chemical reactor technique. Initially a humidity-independent transient reaction occurs that produces NO and SO3. This reaction is inhibited by the sulfuric acid formed. After this stage another reaction follows that is strongly humidity-dependent and occurs on the gold surface beneath a film of aqueous sulfuric acid. This reaction produces HNO2, NO, and H2SO4
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Ohh u mean gold doesn't react with sulfuric acid...
It's not true...
But it reacts on some how.
The reaction of sub-ppm amounts of SO2 and NO2 in dry and humid air on a gold foil was studied using a chemical reactor technique. Initially a humidity-independent transient reaction occurs that produces NO and SO3. This reaction is inhibited by the sulfuric acid formed. After this stage another reaction follows that is strongly humidity-dependent and occurs on the gold surface beneath a film of aqueous sulfuric acid. This reaction produces HNO2, NO, and H2SO4
What does <<SO2 and NO2 in dry and humid air>> have to do with sulphuric acid?
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If anything:
This reaction is inhibited by the sulfuric acid formed.
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ya [8D]
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what is the product of
H2SO4+HNO3= ?
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Ooo! I was just doing that yesterday! [:)]
HNO3 + H2SO4 ↔ NO2+ + HSO4- + H2O
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It's a simple answer any one would have answered it....
Answer is H2O+NO2+(-)HSO4
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Yes, however the acids must be quite pure (almost no water) and H2SO4 must be in excess (to bind the water molecule formed in the reaction) or the very strong acid NO2+ will react again with water:
NO2+ + H2O --> HNO3 + H+.
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Do you have to keep the temperature of the solution low?
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Do you have to keep the temperature of the solution low?
Don't think so.
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Higher temperature favors the dinitration product when adding nitro groups onto an aromatic ring right? Or is that just my memory playing games?
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Higher temperature favors the dinitration product when adding nitro groups onto an aromatic ring right? Or is that just my memory playing games?
This is a different question.
Yes, higher T favors the nitrations but sometimes these reactions are auto-catalityc or the products can decompose in presence of the reagents, so you have to keep the T low enough if you don't want to go to hospital...
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Okay, got that. Thanks. [:)]
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What happens when this solution is heated?
NO2+ + HSO4- + H2O
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What do you want to do?
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I am mixing HNO3 and H2SO4 in the ration of 4:1, and heating it to drop on IC to make the die visible (for etching plastic).
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I am mixing HNO3 and H2SO4 in the ration of 4:1, and heating it to drop on IC to make the die visible (for etching plastic).
1.Why 4:1?
2.The HNO3 is more than 98%?
3.You use that mix to dissolve plastic or what, exactly?
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This is to etch epoxy or plastic any of this...
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Ah, finally. The answer. And some sanity too. [:)]
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I am mixing HNO3 and H2SO4 in the ration of 4:1, and heating it to drop on IC to make the die visible (for etching plastic).
1.Why 4:1?
2.The HNO3 is more than 98%?
3.You use that mix to dissolve plastic or what, exactly?
I dont know y v r using 4:1, and The HNO3 is 98%
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I dont know y v r using 4:1
Eh? Is your keyboard broken?
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Are you trying to say: I dont know why they are using 4:1?
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I dont know y v r using 4:1
Eh? Is your keyboard broken?
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Are you trying to say: I dont know why they are using 4:1?
i was taking about our team. our team has been trained to use the above spec.