Solid state, % of oxidation states in non-stoichiometric compounds

[hexed river]

How do I do these type of questions? What's the core concept?

[regal quarry]

<@&1227988359910260737>

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[eager forge]

yo bro paper ho gaya na kal to??

and i have an approach for this thru Redox

nvm diff questions

[hexed river]

bitsat

[robust iron]

workind please :)
this is charge balance and mass balance!

pyq hai btw

[hexed river]

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

[eager forge]

right right ok

[hexed river]

theoretically i understand the crystal needs to be electrically neutral

but i dont get how to apply that to this question

[robust iron]

Don’t do this.

[tacit saffron]

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?

[tacit saffron]

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.

[hexed river]

ahh

got it

electrical neutrality

brain kicked in

every M(2+) x contributes 2, M(3+) contributes 3 and oxygen -2

gotchu

[hexed river]

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

[balmy valve]

2x + 3(0.83-x) -2 = 0
x/0.83 should be the ans right ?

[hexed river]

yep

[balmy valve]

alr

btw

can we think like 0.83 ions have a charge ( or oxdn state) of +2

[hexed river]

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

[balmy valve]

nvm this , diff thought process

[hexed river]

alr alr

should i close?

[balmy valve]

yeah

[hexed river]

+solved iTeachChem