John paul III
Hazard to Others
Posts: 110
Registered: 28-4-2018
Member Is Offline
Mood: No Mood
|
|
Synthesis of alkali/alkaline earth peroxide by disproportionation
It's possible to synthesize alkali peroxides by disproportionation of oxides i.e. to make K2O -> K2O2 +K at around 450°C. Is it possible to do
something similiar with CaO? Also, is there an easy and low temp way to convert KOH to K2O?
[Edited on 28-4-2018 by John paul III]
[Edited on 28-4-2018 by John paul III]
|
|
|
Rhodanide
Hazard to Others
Posts: 348
Registered: 23-7-2015
Location: Ｔｈｅ ８０ｓ
Member Is Offline
Mood: That retro aesthetic
|
|
Quote: Originally posted by John paul III  | It's possible to synthesize alkali peroxides by disproportionation of oxides i.e. to make K2O -> K2O2 +K at around 450°C. Is it possible to do
something similiar with CaO? Also, is there an easy and low temp way to convert KOH to K2O?
[Edited on 28-4-2018 by John paul III]
[Edited on 28-4-2018 by John paul III] |
I'm not sure about KOH, but I DO know that I once saw a video about a guy who made K2O from heating the shit out of
K2CO3.
|
|
|
urea1990
Harmless
Posts: 13
Registered: 20-3-2017
Member Is Offline
Mood: No Mood
|
|
K2O + H2O ⇌ 2KOH
Edit: I've looked at the relative heat of formation for this reaction, and no amount of heat will decompose 2KOH into K2O and
H2O.
2 moles of the hydroxide (ΔHf = -425 kJ/mol) can be formed from the oxide (ΔHf = -361 kJ/mol) and H2O (ΔHf = -242 kJ/mol); this means
the hydroxide reaction is vastly favoured over the backwards reaction. In fact, no amount of heating of the hydroxide will form the oxide plus
H2O - that reaction is just pushing it far too far up the entropic cliff, so to speak.
[Edited on 30-4-2018 by urea1990]
|
|
|
John paul III
Hazard to Others
Posts: 110
Registered: 28-4-2018
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by Rhodanide | | Quote: Originally posted by John paul III | It's possible to synthesize alkali peroxides by disproportionation of oxides i.e. to make K2O -> K2O2 +K at around 450°C. Is it possible to do
something similiar with CaO? Also, is there an easy and low temp way to convert KOH to K2O?
[Edited on 28-4-2018 by John paul III]
[Edited on 28-4-2018 by John paul III] |
I'm not sure about KOH, but I DO know that I once saw a video about a guy who made K2O from heating the shit out of
K2CO3. |
Was it done with a lab gas burner or in a foundry of sorts? Theoretically teclu burner would give the right temperature (but reality often differs
with heat sources)
|
|
|
Rhodanide
Hazard to Others
Posts: 348
Registered: 23-7-2015
Location: Ｔｈｅ ８０ｓ
Member Is Offline
Mood: That retro aesthetic
|
|
| Quote: Originally posted by John paul III | | Quote: Originally posted by Rhodanide | | Quote: Originally posted by John paul III | It's possible to synthesize alkali peroxides by disproportionation of oxides i.e. to make K2O -> K2O2 +K at around 450°C. Is it possible to do
something similiar with CaO? Also, is there an easy and low temp way to convert KOH to K2O?
[Edited on 28-4-2018 by John paul III]
[Edited on 28-4-2018 by John paul III] |
I'm not sure about KOH, but I DO know that I once saw a video about a guy who made K2O from heating the shit out of
K2CO3. |
Was it done with a lab gas burner or in a foundry of sorts? Theoretically teclu burner would give the right temperature (but reality often differs
with heat sources) |
It needed a stupid amount of heat, from what I can remember. The guy used the arc from a MOT, here's the link to the vid: https://www.youtube.com/watch?v=tY5Qa-qrd3Y
|
|
|
fusso
International Hazard
Posts: 1922
Registered: 23-6-2017
Location: 4 ∥ universes ahead of you
Member Is Offline
|
|
| Quote: Originally posted by Rhodanide | | Quote: Originally posted by John paul III | | Quote: Originally posted by Rhodanide | | Quote: Originally posted by John paul III | It's possible to synthesize alkali peroxides by disproportionation of oxides i.e. to make K2O -> K2O2 +K at around 450°C. Is it possible to do
something similiar with CaO? Also, is there an easy and low temp way to convert KOH to K2O?
[Edited on 28-4-2018 by John paul III]
[Edited on 28-4-2018 by John paul III] |
I'm not sure about KOH, but I DO know that I once saw a video about a guy who made K2O from heating the shit out of
K2CO3. |
Was it done with a lab gas burner or in a foundry of sorts? Theoretically teclu burner would give the right temperature (but reality often differs
with heat sources) |
It needed a stupid amount of heat, from what I can remember. The guy used the arc from a MOT, here's the link to the vid: https://www.youtube.com/watch?v=tY5Qa-qrd3Y |
Whats MOT?
|
|
|
Bert
|
Thread Moved
5-5-2018 at 22:45 |
Diachrynic
Hazard to Others
Posts: 219
Registered: 23-9-2017
Location: western spiral arm of the galaxy
Member Is Offline
Mood: zenosyne
|
|
A MOT is a Microwave Oven Transformer. They're the reason a lot of people take apart microwaves, despite MOT's being extremely dangerous if you're not
careful.
https://mad-science.wonderhowto.com/how-to/turn-microwave-ov...
You can make high voltage or high amperage with these, whatever ya need.
we apologize for the inconvenience
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
