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Reaction of Silver Sulphide on Copper?

Reaction of Silver Sulphide on Copper? - Chemistry Forum

Reaction of Silver Sulphide on Copper? - Chemistry Forum. Discuss chemical reactions, chemistry.


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  #1  
Old 02-02-2004, 04:08 PM
duncan
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Default Reaction of Silver Sulphide on Copper?



Hi

I work as a R+D Engineer in the UK designing electrical switchboards
for energy distribution. I've been asked, what, if any, problems I
might encounter when installing a switchboard in a room that has
silver sulphide in the air. My obvious worry concerns the large
quantity of copper that we have in our switchboards. My intial
findings are that silver sulphide is quite unreactive but I am
concerned that the silver sulphide might cause tracking problems
between phases. Will the silver sulphide react with the copper?

Thanks



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  #2  
Old 02-02-2004, 04:30 PM
hanson
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Default Reaction of Silver Sulphide on Copper?

\"duncan" <[Only registered users see links. ]-dot-com.no-spam.invalid>
wrote in message news:401e75e2_1@127.0.0.1...
My first inclination is that since Silver is more noble then Copper
you may get indeed a reaction like: Ag2S + Cu ---> 2 Ag + CuS.
So, *theoretically*, you'll end up with well conducting Silver metal
and CuS, Cu2S and also Cu2O, all three being semiconducting.
However, whether the conditions are right for these reaction to take
place in your environment, that can only be established by experiment.
hanson
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  #3  
Old 02-02-2004, 06:47 PM
Bevan Price
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Default Reaction of Silver Sulphide on Copper?


"hanson" <[Only registered users see links. ]> wrote in message news:jWuTb.8616$[Only registered users see links. ].pas.earthl ink.net...

The direct reaction is likely to be too slow to measure at room temperature. More of a problem would be if acidic fumes
were present - including those released by some solder fluxes. In this event, silver sulphide would be converted to
hydrogen sulphide gas, and the latter would react fairly quickly with copper.

Bevan



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  #4  
Old 02-02-2004, 11:39 PM
Steve Turner
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Default Reaction of Silver Sulphide on Copper?

"Bevan Price" <bevan$$DELETETHESE$%%[Only registered users see links. ]> wrote:


....and so would the silver ion, along the lines of what hanson
originally posted. This makes me a little nervous. You're banking on
[slow] kinetics to make things all right.

Steve Turner

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  #5  
Old 02-03-2004, 12:13 AM
Don Wilkins
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Default Reaction of Silver Sulphide on Copper?

On 2 Feb 2004 10:08:02 -0600,
[Only registered users see links. ]lid (duncan) wrote:


No but how in hell are you getting silver sulphide in the air in a
room?

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  #6  
Old 02-03-2004, 02:27 AM
Cary Kittrell
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Default Reaction of Silver Sulphide on Copper?

In article <[Only registered users see links. ]> [Only registered users see links. ] writes:
<On 2 Feb 2004 10:08:02 -0600,
<[Only registered users see links. ]-dot-com.no-spam.invalid (duncan) wrote:
<
<>,;Hi
<>,;
<>,;I work as a R+D Engineer in the UK designing electrical switchboards
<>,;for energy distribution. I've been asked, what, if any, problems I
<>,;might encounter when installing a switchboard in a room that has
<>,;silver sulphide in the air. My obvious worry concerns the large
<>,;quantity of copper that we have in our switchboards. My intial
<>,;findings are that silver sulphide is quite unreactive but I am
<>,;concerned that the silver sulphide might cause tracking problems
<>,;between phases. Will the silver sulphide react with the copper?
<

<No but how in hell are you getting silver sulphide in the air in a
<room?

Actually, that was going to be my first question, too...


-- cary


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  #7  
Old 02-03-2004, 03:33 AM
Muhammar
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Default Reaction of Silver Sulphide on Copper?

It should be OK, as long as you do not have naked copper surfaces. I
believe copper wires usualy have insulation (or at least laquer) on
them. You should install dust screens/filters in the switchboard box.

I believe that Ag2S is pretty unreactive. Some sulfides can generate
acidity over long periods of time when exposed to moisture (pool of
water) and bacterias. But silver is a very strong antiseptic and no
sensible bacteria is going to oxidize it, especialy when dry.

Steve Turner <[Only registered users see links. ].net> wrote in message news:<[Only registered users see links. ]>. ..
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  #8  
Old 02-03-2004, 07:05 PM
Bevan Price
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Default Reaction of Silver Sulphide on Copper?


"Don Wilkins" <[Only registered users see links. ]> wrote in message news:[Only registered users see links. ]...
Air pollution, flatulence, etc. Human rear-end exhaust ("farts") can contain sulphur compounds, it isn't methane that
makes the smell.

Bevan





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  #9  
Old 02-03-2004, 11:36 PM
Steve Turner
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Default Reaction of Silver Sulphide on Copper?

"Bevan Price" <bevan$$DELETETHESE$%%[Only registered users see links. ]> wrote:


Typically not silver, though....

Steve Turner

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  #10  
Old 02-04-2004, 08:59 AM
Steven
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Default Reaction of Silver Sulphide on Copper?

Hi,

which I think you want to know, weather hydrogen sulfide (which is
always present in air in small quantities as a pollutant, especially
in rooms where people live, smoke and also in cities, industrial
areas, etc..) will react with copper. Yes, of course it will do, but
only in a small degree on the surface. But to ask you seriously, how
could silver sulfide be gaseous? Silver sulfide is the black coating
an fresh silver, which appeares when it is storaged in the same
environment as already stated.
But you also has to consider, that copper has already a small
protecting shield of copper oxides (Copper(I)-oxyde (yellow-red) and
Copper(II)-oxyde (brown-black). These coatings will "protect" the
copper from further beeing oxidised. Under normal oxidation processes,
there will only a small coating on the surface on the copper.
The copper sulfide will be formed, when you will exposure freshly
prepared copper metal to hydrogen sulfide athmosphere,...........


[Only registered users see links. ]lid (duncan) wrote in message news:<401e75e2_1@127.0.0.1>...
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