Log in

No account? Create an account
Dissolving MnO2 with HNO3 - Chemistry Help [entries|archive|friends|userinfo]
Chemistry Help

[ userinfo | please read rules!!! ]
[ archive | here ]

Dissolving MnO2 with HNO3 [Mar. 6th, 2011|11:14 pm]
Chemistry Help


I ask a lot of questions and you all are always very helpful. (:

We recently had a lab where we used diluted HNO3 to clean a filter that we had collected MnO2 from. Why was HNO3 used when MnO2 is insoluble in nitric acid?

Someone showed me this reaction:

2MnO2 + 4HNO3 -> 2Mn(NO3)2 + 2H2O

which does not make sense to me since Mn(IV) is being reduced to Mn(II), but I don't see anything being oxidized. What am I missing here?

Thanks in advance for any help/insight.

[User Picture]From: manfrommlwkee
2011-03-07 02:50 pm (UTC)
I don't think your equation is balanced. I think the typical reaction for doing this also involves oxalic acid as a reactant and liberates carbon dioxide as a product.
(Reply) (Thread)
[User Picture]From: doubtmars
2011-03-16 02:52 am (UTC)
It isn't. (: This reaction was given to me by someone else, but it didn't make sense to me.

I read about the oxalic acid looking through the textbooks and online, but we didn't use that in the lab.

Thank you for responding.
(Reply) (Parent) (Thread)
(Deleted comment)
(Deleted comment)