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Topic: Mn(CH3CO2)2 Manganese acetate help  (Read 1935 times)

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Offline Joeyups7

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Mn(CH3CO2)2 Manganese acetate help
« on: August 08, 2018, 07:16:24 AM »
So I have an excess of Mno2 and wanted some other compounds. So I took some dilute acetic acid and added Mno2 until there was no more reactions going on. Once bubbling stopped I filtered the solution and began to evaporate and then heated until it was all evaporated. To my surprise there was no crystal or powder but only a sticky goo like substance. So I added some distilled water to bring back into the solution and tried just evaporating without boiling and got the same results. The last thing I did was again add water but this time added NaHCO3 until no more bubbling. It appears that I now have H2MnO2 and C2H3NaO2. So I believe there was indeed manganese acetate. My question is how in the world do I get it to crystallize? Any help greatly appreciated thank you.

Offline chenbeier

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Re: Mn(CH3CO2)2 Manganese acetate help
« Reply #1 on: August 10, 2018, 03:12:17 PM »
First MnO2 can not get Mn-II. Check Oxidation numbers of manganese.  Acetate can create polymer adducts, which not crystilize.

Offline Joeyups7

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Re: Mn(CH3CO2)2 Manganese acetate help
« Reply #2 on: August 10, 2018, 04:29:24 PM »
Thank you for the reply. I made a mistake and said I ended up with H2MnO2 which is totally untrue. I did however get MnCO3. Isn't that an Mn-II?

Offline chenbeier

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Re: Mn(CH3CO2)2 Manganese acetate help
« Reply #3 on: August 10, 2018, 04:44:09 PM »
Yes it is. But the question is to go from MnO2 it is Mn-IV to Mn-II. You need a redox reaction.  Acetic acid alone is not able to do it.

Offline Joeyups7

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Re: Mn(CH3CO2)2 Manganese acetate help
« Reply #4 on: August 12, 2018, 03:03:45 PM »
Thank you for the replies. Helping me learn!

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