will the NaOH and NaOCl need to be aqueous or molten?woelen - 1-12-2013 at 10:13
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 - 1-12-2013 at 10:23
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.
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 - 5-12-2013 at 11:41
You can purify that MnO2 from battery by sulphite reduction and then oxidize the Mn2+ salt with bleach.nezza - 5-12-2013 at 14:16
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 - 5-12-2013 at 14:48
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 - 6-12-2013 at 06:31
