Sciencemadness Discussion Board

Displace oxygen by chlorine or even bromine?

SupFanat - 1-5-2015 at 13:26

What elements are capable of displacing oxygen from some oxides? Of course fluorine. But are there any case when chlorine or even bromine can do the same?

blogfast25 - 1-5-2015 at 13:43

Bromine almost certainly not. Chlorine in a few exceptional cases perhaps. The oxides tend to have significantly more negative Free Energies of Formation than the bromides or chlorides.

Etaoin Shrdlu - 1-5-2015 at 15:59

"Some" oxides? No specified conditions? This question is far too vague to be meaningful. Can we delve into organic chemistry?

Certainly, calcium oxide will react with HCl to form calcium chloride and water. It seems very likely reaction with HBr would proceed similarly.

gdflp - 1-5-2015 at 17:59

Quote: Originally posted by Etaoin Shrdlu  

Certainly, calcium oxide will react with HCl to form calcium chloride and water. It seems very likely reaction with HBr would proceed similarly.

That's an acid-base reaction though, not a redox reaction. I think that a redox reaction was what the OP was looking for. 2X2 + 2MO --> O<sub>2</sub> + 2MX<sub>2</sub> where M is a metal and X is a halogen.

Etaoin Shrdlu - 1-5-2015 at 18:06

A reasonable interpretation. This is what I meant by "far too vague to be meaningful" since there's no mention of redox whatsoever.

[Edited on 5-2-2015 by Etaoin Shrdlu]

chornedsnorkack - 27-5-2015 at 09:00

Quote: Originally posted by blogfast25  
The oxides tend to have significantly more negative Free Energies of Formation than the bromides or chlorides.

Standard potential of chlorine is +1,36 V. That of oxygen is +1,23 V.

SupFanat - 27-5-2015 at 13:58

How does water react with chlorine in the practice?
In theory this reaction would give about +0,13 V.

aga - 27-5-2015 at 14:29

Please post all further non-referenced stuff in Beginnings.

Most of the other topics are for people who want to discuss actual chemistry (or even science!) and not random garbage.

By posting simple questions in Chemistry In General etc you're just causing more work for the moderators.

If you have no idea, post in Beginnings or Whimsy.

[Edited on 27-5-2015 by aga]