dry cells (1 Viewer)

[tina_goes_doo]

I have seen two different versions of this so can anyone tell me the reduction equation of a dry cell?

 

[aim54x]

no can do. but i have onlyt seen one. did u memorise any???

~HONOURARY MEMBER MHS MAFIA~

 

[Paroissien]

2Mn2O + 2NH4 + 2e- ---> Mn2O2 + NH3 + 2H2O

 

[tina_goes_doo]

The other one i have seen is NH4+ + MnO2(s) + H2O(l) + e- -----> Mn(OH)3(aq) + NH3(aq)

 

[Paroissien]

Yeah I know, I used to go with that one, but it looks to messed up. The one I posted is Xayma's and he knows what he is talking about

 

[Xayma]

It is MnO₂+2NH₄⁺+2e^- ^_______> MnO+2NH₃+H₂O

 

[tina_goes_doo]

Yeah you have a point. Alright then, thanks.

 

[Xayma]

Yeah I know, I used to go with that one, but it looks to messed up. The one I posted is Xayma's and he knows what he is talking about

Use the one I posted in this thread, that one is wrong and I had a wrong one in my chem summary (The one above I must of mistyped) if you notice the Oxygen atoms dont balance out in the other one, the latter one does.

 

[Paroissien]

Cheers, but I didn't inspect it too closely

 

[CM_Tutor]

Xayma, that should be 2MnO - ie 2 x manganese(II) oxide, not Mn₂O₂, which would be manganese(II) peroxide.

 

[Paroissien]

Other than that is his equation correct?

 

[CM_Tutor]

Yes .

 

[Xayma]

Fixed, my source was wrong.

Which means you can now take out a factor of 2.

Trust CM to come back when the crunch is on been having fun with the PhD or something?

 

[Paroissien]

MnO2 + 2NH4+ + 2e- ----> MnO + 2NH3 + H2O

Is that what we have now?

 

[CM_Tutor]

Fixed, my source was wrong.

Which means you can now take out a factor of 2.

Trust CM to come back when the crunch is on been having fun with the PhD or something?

busy with PhD - yes. Fun? well, maybe sometimes.

 

[Xayma]

MnO2 + 2NH4+ + 2e- ----> MnO + 2NH3 + H2O

Is that what we have now?

Yes.

Bah CM_Tutor you ruined my plan to give out false information so others do worse in chem so its scaling goes up for me , well it was considered.

What is your PhD on anyway?

 

[CM_Tutor]

Chemistry Education

 

[lucyinthehole]

Chemistry Education

i wish my teacher bothered to spend a little time doing that


Xayma, i knew that was your evil plan all along!