shaheerniazi
Hazard to Self
Posts: 70
Registered: 25-11-2013
Location: Pakistan
Member Is Offline
Mood: radioactive
|
|
Synthesis of Sodium permanganate
I have acquired some NaOH and I read that mixing manganese dioxide with sodium hypochlorite and sodium hydroxide gives these results:
2 MnO2 + 3 NaClO + 2 NaOH → 2 NaMnO4 + 3 NaCl + H2O
will the NaOH and NaOCl need to be aqueous or molten?
|
|
|
woelen
Super Administrator
Posts: 8014
Registered: 20-8-2005
Location: Netherlands
Member Is Offline
Mood: interested
|
|
This reaction occurs in aqueous solution, but it has no preparative meaning at all. It only works for freshly prepared hydrous MnO2 (a flocculent dark
brown precipitate), not with the commercial dark grey crystalline powder. An besides that, the yield is VERY low. Maybe 0.1% of hypochlorite is used
up in formation of permanganate, the rest decomposes to oxygen, chloride and some chlorate. But the color of permanganate is very strong and even if
only 0.01% is converted you already get a deep purple color.
In molten state you don't get permanganate. Hypochlorite is not possible in the molten state, it only exists at room temperature and a little higher.
So, the molten state reaction is impossible.
|
|
|
BlackDragon2712
Hazard to Others
Posts: 124
Registered: 22-12-2012
Location: Everywhere
Member Is Offline
Mood: Sleepy
|
|
as woelen said only a little quantity of permanganate is formed but it can still be used for some chemical demostration as the rainbow reaction.
Nurdrage has a good video about this: http://www.youtube.com/watch?v=70AfSqP5YK8
|
|
|
vmelkon
National Hazard
Posts: 669
Registered: 25-11-2011
Location: Canada
Member Is Offline
Mood: autoerotic asphyxiation
|
|
I have already tried with MnO2 coming from batteries (contains graphite powder as well and who knows what). Forget it, nothing happens.
Perhaps you can do it with a pure MnO2, freshly prepared.
|
|
|
Random
International Hazard
Posts: 1120
Registered: 7-5-2010
Location: In ur closet
Member Is Offline
Mood: Energetic
|
|
You can purify that MnO2 from battery by sulphite reduction and then oxidize the Mn2+ salt with bleach.
|
|
|
nezza
Hazard to Others
Posts: 324
Registered: 17-4-2011
Location: UK
Member Is Offline
Mood: phosphorescent
|
|
I thought that fusing caustic alkali with MnO2, either in the presence of air or with a nitrate salt gives the alkali manganate. This is dark green.
In acid this disproportionates to permanganate and Mn2+.
|
|
|
Mailinmypocket
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
I have tried looking quickly but couldn't find it and due to my laziness aborted the search. If you look in the pretty pictures 1 thread, there was a
member who made some sodium permanganate and provided a method by which they produced it. Check the thread out, it may be of assistance.
|
|
|
TheChemiKid
Hazard to Others
Posts: 493
Registered: 5-8-2013
Location: ̿̿ ̿̿ ̿'̿'̵͇̿̿з=༼ ▀̿̿Ĺ̯̿̿▀̿ ̿ ༽
Member Is Offline
Mood: No Mood
|
|
Yes, but this video is on potassium permanganate and as stated at 1:50, this will not work with sodium-based chemicals (I really wish it did though).
When the police come
\( * O * )/ ̿̿ ̿̿ ̿'̿'̵͇̿̿з=༼ ▀̿̿Ĺ̯̿̿▀̿ ̿ ༽
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
