rherzal
Harmless
Posts: 4
Registered: 5-8-2017
Member Is Offline
Mood: No Mood
|
|
Strange brown precipitate
one day i found some thin copper wire from an old ceramic resistor, i put it in some dilute HCl(i bought it as a descaler) along with some H2O2 and
left it there for a week . after that week the wire disappeared and i was left with a clear blue solution. i wanted to precipitate the Cu+2 ions and i
added some Na2CO3 , but something brown precipitated alongside the blue copper ions .is it possible that the wire was an iron-copper alloy instead of
copper ?
|
|
|
XeonTheMGPony
International Hazard
Posts: 1638
Registered: 5-1-2016
Member Is Offline
Mood: No Mood
|
|
if it was a wire wound resister it was not pure copper.
|
|
|
gdflp
|
Thread Moved
5-8-2017 at 05:20 |
rherzal
Harmless
Posts: 4
Registered: 5-8-2017
Member Is Offline
Mood: No Mood
|
|
Good to know.
|
|
|
XeonTheMGPony
International Hazard
Posts: 1638
Registered: 5-1-2016
Member Is Offline
Mood: No Mood
|
|
If making reagents the copper in house wiring is fairly pure, use that in the future. If making copper sulfate add high test peroxide to it and warm
it, will react vigerously so you won't have to Waite as long between steps
|
|
|
unionised
International Hazard
Posts: 5109
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
It's possible- even likely- that the wire is a copper/ nickel alloy containing a little iron or manganese
as an impurity.
https://en.wikipedia.org/wiki/Constantan
https://en.wikipedia.org/wiki/Manganin
It may even be this
https://en.wikipedia.org/wiki/Nichrome
which isn't a copper alloy.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
