21 replies to this topic

[TheChemist]

I have now tried the most well known way to produce Pb3O4, that is heating PbO on an iron plate at 450C to oxidize the lead further. ( I used a spoon on a gas burner)
For some reason this did not work as it was supposed to .
Maybe the burner removed all the oxygen needed for the process.
By the way, Pb3O4 is really (PbO)2PbO2, is there any particular reason for using Pb3O4 and not PbO.
When I tested it in the lab they colour the flame in the same way when burned.
I will keep looking, and return if I find anything useful.

[pyromaniac303]

By the way, Pb3O4 is really (PbO)2PbO2, is there any particular reason for using Pb3O4 and not PbO.
When I tested it in the lab they colour the flame in the same way when burned.

The purpose of it is not a flame colourant, it is used as the oxidiser in dragon eggs. I think that maybe the Pb3O4 is more unstable than PbO, and has a higher oxygen percentage, so breaks down easier to release its oxygen.

[leosedf]

Correct!
In the mean time i bought a red lead primer, it's used to protect from corossion. I will dilute it with white spirit and pass it through a paper filter to see what i am going to get.

But i still have lead nitrate to convert it to lead tetraoxide.

[TheChemist]

Used as an oxidiser, the oxidizing part of Pb3O4 ([Pb(II)O]2Pb(IV)O2) is the Pb(IV).
I guess the Pb(IV) is stabilized in this compound as compared to pure Pb(IV)O2 that is a strong oxidizer.
PbO2 will ignite fx. red phosphorus and hydrogensulfide (and most likely a lot of other substances) on contact.

[EnigmaticBiker]

I have now tried the most well known way to produce Pb3O4, that is heating PbO on an iron plate at 450C to oxidize the lead further. ( I used a spoon on a gas burner)
For some reason this did not work as it was supposed to .
Maybe the burner removed all the oxygen needed for the process.

Hi, I just found a reference in one of my very old textbooks:-

"It is prepared by very carefully heating massicot (PbO) or white lead 2PbCO3.Pb(OH)2 for about a day at a temperature not exceeding 400 degC."

I've never done it myself, preferring Bismuth Trioxide for Dragons eggs.

[selwyndog]

Ready made electrodes covered in PbO2 are easily availble from fully charged lead acid batteries used in cars. The chlorate oxidation works quite well using these as the anode.

PbO2 can also be made by placing two lead plates into sulphuric acid and applying a voltage across them. A brown layer of lead(IV)oxide develops on the anode

Edited by selwyndog, 08 February 2007 - 07:48 PM.

[Caramanos2000]

I tried this to make kclo4s with no success whatsoever. I would try again though. Keep better track of variables. I can get tungsten anodes if anyones whants some.