A2 Chemistry Transitional Metal Help Watch

plasmaman
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Transition not Transitional
June 2013 F325
Everybody's favourite, transition metals

We're told that solution X contains the complex ion [Fe(H2O)6]3+
In addition, we are told that in experiment 2, excess zinc powder is added to solution X. A complex ion is formed as well as Zn2+

The question is to write the reaction representing the formation of complex ion C, and the answer is 2[Fe(H2O)6]3+ + Zn > 2[Fe(H2O)6]2+ + Zn2+

If anybody could help me get my head around this, I'd appreciate it.
The first complex has gained electrons, but where do they go? Onto the Fe ion? Complex C has only gained one electron, but the zinc appears to have lost two... There's a phantom electron?

I'm probably missing something obvious, but your guidance would be appreciated. Grazi
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plasmaman
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Infraspecies
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Hey there,

2[Fe(H2O)6]3+ + Zn

There are two [Fe(H2O
)6]3+ for every Zn
Each gains one electron, Zn provides two.
It all balances.

Think stoichiometry, always.

Also, you don't need to bump here, it moves fairly slowly.
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plasmaman
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(Original post by Infraspecies)
Hey there,

2[Fe(H2O)6]3+ + Zn

There are two [Fe(H2O
)6]3+ for every Zn
Each gains one electron, Zn provides two.
It all balances.

Think stoichiometry, always.

Also, you don't need to bump here, it moves fairly slowly.
Perfect, thanks for the help
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