Chemistry P31

[bluefa1con]

true but i think both do actually
A gets rusted, and so smaller
B loses electrons as it gives them to A

in book it is mentioned rusting is a redox reaction
oxidation strictly happens on B
actually as B loses electron the ion dissolves and the mass of B decreases
rust settles on the A increasing its mass as its discharged

formula was Al2O3.2H2O

 

[reya]

what was the formula for stoichiometry

number of moles =mass in grams/Ar or Mr

 

[Manobilly]

Its A.

 

[bluefa1con]

Its A.

care to explain your logic

 

[reya]

Its A.

I really hope that u r r8 !!

 

[Saadiya Ahmed]

what was the formula for stoichiometry

Fe2o3(OH)2

 

[dana xP]

its definitly A since fe(ii) is oxidized to fe(iii) (rust) thought bubbling O2 gas

 

[Manobilly]

Because oxygen is bubbled more on it directly!

 

[ahmed soliman]

I wrote B too
what did you write for the oxidant and oxidation?

remind me with the question please

 

[Manobilly]

I

I really hope that u r r8 !!

Inshallah it is right

 

[EpicLol]

Fe2o3(OH)2

Nononononono.....lol I put Fe2O3.2H20
because it was hydrous but I think Im wrong

 

[reya]

Fe2o3(OH)2

I wrote FeO2H2O . may be u r8!!

 

[EpicLol]

its definitly A since fe(ii) is oxidized to fe(iii) (rust) thought bubbling O2 gas

No because The electrons flow from the cathode(B) to the anode(A) therefore, the Fe in the cathode is going out as ions Fe3+ and releasing electons....the Fe3+ then reacts and forms Fe2O3....
I think this is right....coz thats how I learnt it in school....but Im not entirely sure that its B....

 

[sazzabazza]

Its A.

That would mean oxidation and reduction is occurring at the same time, explain how B is gaining electrons.

 

[ahmed soliman]

i dont think A is right

 

[EpicLol]

I wrote FeO2H2O . may be u r8!!

But Fe2O3(OH)2 does not exist and (OH)2 would give 2H and 2O but we need 2H2O....so it should be Fe2O3.2H2O as it is hydrous what do u think?

 

[Saadiya Ahmed]

I wrote FeO2H2O . may be u r8!!

Ur ryte...its hydrated...now m confused! :/

 

[EpicLol]

Ur ryte...its hydrated...now m confused! :/

Fe2O3.2H2O do u think this is rite for hydrated?

 

[msn201]

Guyzz i wrote it FeO2.H2O because i got the mole ratio 1:2:1 - what do u think?

 

[reya]

Ur ryte...its hydrated...now m confused! :/

don't be confused! think positive