Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: Electrolysis of Copper Sulfate Pentahydrate CuSO4.5H2O I need some really inert anodes that can withstand corrosion so does...
K12Chemistry
Hazard to Self
**




Posts: 63
Registered: 3-1-2013
Member Is Offline

Mood: No Mood

[*] posted on 3-5-2013 at 10:16
Electrolysis of Copper Sulfate Pentahydrate CuSO4.5H2O I need some really inert anodes that can withstand corrosion so does anyone know any apart from
gold and platinum. Would silver work?


I need to electrolyse copper sulfate to make sulfuric acid but i need an inert anode. Does anyone know any anodes that i can use apart from gold and platinum? I heard someone used silver, would that work?



View user's profile View All Posts By User
Pyro
International Hazard
*****




Posts: 1305
Registered: 6-4-2012
Location: Gent, Belgium
Member Is Offline

Mood: No Mood

[*] posted on 3-5-2013 at 10:18


carbon. nickel should work, SS too,...



all above information is intellectual property of Pyro. :D
View user's profile View All Posts By User
Mixell
National Hazard
****




Posts: 449
Registered: 27-12-2010
Member Is Offline

Mood: No Mood

[*] posted on 3-5-2013 at 10:54


Don't use carbon, otherwise your sulfuric acid acid will be black.

Nickel will dissolve, SS too. Copper/silver might work (or they may corrode). MMO should not corrode. Best choice is platinum of-course, but it's quite costly.
View user's profile View All Posts By User
garage chemist
chemical wizard
*****




Posts: 1803
Registered: 16-8-2004
Location: Germany
Member Is Offline

Mood: No Mood

[*] posted on 3-5-2013 at 10:57


Acidic solutions of sulfates can be electrolyzed with lead anodes, which evolve oxygen. They get coated with a film of PbO2 which flakes off a slight bit but if you filter the resulting solution before boiling down it's ok. The solution must not contain any anions besides sulfate.
Don't let the sulfuric acid concentration rise too much (above 50%) because lead is attacked by strong sulfuric acid.
Nickel is unsuitable, as is silver. Both are attacked.
Carbon can be used, whether it is a good choice depends on quality (EDM Graphite vs. gouging rods) and how strong the erosion is, which in turn depends on current density and temperature.

Making sulfuric acid yourself this way is not viable. Buy it or forget it.

[Edited on 3-5-2013 by garage chemist]




www.versuchschemie.de
Das aktivste deutsche Chemieforum!
View user's profile View All Posts By User
K12Chemistry
Hazard to Self
**




Posts: 63
Registered: 3-1-2013
Member Is Offline

Mood: No Mood

[*] posted on 4-5-2013 at 03:05


OK so I am getting lead rods. Does anyone know where I can get some in the UK



View user's profile View All Posts By User
garage chemist
chemical wizard
*****




Posts: 1803
Registered: 16-8-2004
Location: Germany
Member Is Offline

Mood: No Mood

[*] posted on 4-5-2013 at 03:27


Get roofing lead sheet instead. Should be available at the next metal goods store.



www.versuchschemie.de
Das aktivste deutsche Chemieforum!
View user's profile View All Posts By User
Hexavalent
International Hazard
*****




Posts: 1564
Registered: 29-12-2011
Location: Wales, UK
Member Is Offline

Mood: Pericyclic

[*] posted on 4-5-2013 at 14:01


Platinum-coated mesh or wire isn't horrendously expensive, and don't forget that it can be used many, many times again. I've almost always used carbon electrodes for electrolysis, and simply filtered off the carbon particles when I'm done, using diatomaceous earth as necessary. Boiling the solution for a while can also help to increase the size of these particles, making them significantly easier to filter normally.



"Success is going from failure to failure without loss of enthusiasm." Winston Churchill
View user's profile View All Posts By User
K12Chemistry
Hazard to Self
**




Posts: 63
Registered: 3-1-2013
Member Is Offline

Mood: No Mood

[*] posted on 6-5-2013 at 05:58


Hey Joe do you know where I can get some platinum coated wire or mesh in the UK. Thanks



View user's profile View All Posts By User

  Go To Top