Electochemistry - transferring metal ions through a membrane

[OMG]

I've been experimenting with two cell electrolysis. one halfcell dissolves the metals as chlorides or sulfates and the other halfcell s supposed to deposit them. I still haven't had much success getting the metals over the membrane (clay pot). I can get Cl- to pass through to the anolyte and evolve at the anode but it seems very little or no Fe2+ or Cu+ or Cu2+ get to the cathode.
Any help or advice would be appreciated.
btw. do the actual ions travel through the membrane or do they just transfer the charge amongst themselves and just the charge gets through the membrane?

 

[Anonymous]

OMG working on this myself will post more tonight. Right now I am dissolving some copper with a little gold and palladium on it.

Then I am going to try and recover the copper electrolyticly.

 

[Palladium]

btw. do the actual ions travel through the membrane or do they just transfer the charge amongst themselves and just the charge gets through the membrane?

Yes they actually travel thru the permeable membrane. The permeable membrane will dictate what size ions can pass thru it. It's like a very very small size water filter. The elect draws the ion thru the material like a magnet. The larger ions are blocked according to the pore size.

I use to have a chart that listed different ion sizes in solution. Can't seem to locate it.

Anyone got that info. :?:

 

[Lino1406]

size?

 

[Irons]

btw. do the actual ions travel through the membrane or do they just transfer the charge amongst themselves and just the charge gets through the membrane?

Yes they actually travel thru the permeable membrane. The permeable membrane will dictate what size ions can pass thru it. It's like a very very small size water filter. The elect draws the ion thru the material like a magnet. The larger ions are blocked according to the pore size.

I use to have a chart that listed different ion sizes in solution. Can't seem to locate it.

Anyone got that info. :?:

google <element> radii

Copper, for examole:

http://tinyurl.com/54rv8l


Radii

There are several ways to define radius for atoms and ions. Follow the appropriate hyperlinks for literature references and definitions of each type of radius. All values of radii are given in pm (picometres, or picometers in USA). Conversion factors are:

* 1 pm = 1 x 10-12 metre (meter)
* 100 pm = 1 Ångstrom
* 1000 pm = 1 nanometre (nm, nanometer)




Neutral radii

The size of neutral atoms depends upon the way in which the measurement is made and the environment. Follow the appropriate hyperlinks for definitions of each radius type. The term "atomic radius" is not particularly helpful although its use is widespread. The problem is its meaning, which is clearly very different in different sources and books. Two values are given here, one is based upon calculations and the other upon observation - follow the appropriate link for further details.