Solid state, % of oxidation states in non-stoichiometric compounds
How do I do these type of questions? What's the core concept?
23 Replies
@Dexter
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.yo bro paper ho gaya na kal to??
and i have an approach for this thru Redox
nvm diff questions
bitsat
workind please :)
this is charge balance and mass balance!
pyq hai btw
my thought process was:
M+2 is M2O2, i.e. M1O1
M+3 is M2O3, i.e. M 0.66 O1
since the given compound is M 0.83 O1, and 0.83 is the midpoint of 1 and 0.66, the percentages of +2 and +3 must be 50% each
apparently wrong
charge balance/mass balance how? what's the concept
right right ok
theoretically i understand the crystal needs to be electrically neutral
but i dont get how to apply that to this question
Don’t do this.
iteachchem
Transcription requested by Nimboi [ping if answering]
So, here is the idea. You cross-check if your 50 will give you the answer, it won't, then you see kaha pe tum garbadi ki hai. Whatever answer you get, it should plug in and give you the same values that are in the question, right?
iteachchem
Transcription requested by Nimboi [ping if answering]
What you need to do is total charge, minus two, okay, so minus two charge is given by X amount of what do you call it, M2 plus and 0.83 minus X amount of plus three. That is what you have to start with.
ahh
got it
electrical neutrality
brain kicked in
every M(2+) x contributes 2, M(3+) contributes 3 and oxygen -2
gotchu
why was this wrong?
ohh
neutrality wont be maintained if we directly just take that
that's not how M 0.83 is defined
got it thank u sir
2x + 3(0.83-x) -2 = 0
x/0.83 should be the ans right ?
yep
alr
btw
can we think like 0.83 ions have a charge ( or oxdn state) of +2
eh?
x comes out to be 0.59
sorry no
0.49
you can think 0.49 ions have +2 charge
and the rest have +3
nvm this , diff thought process
alr alr
should i close?
yeah
+solved iTeachChem
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