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Voltaic Cells

by Precursor
Tags: cells, voltaic
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Apr26-09, 04:27 PM
P: 222
The problem I have is just a detail I want to clarify about the voltaic cell.

A standard cell is a voltaic cell in which each half-cell contains all entities shown in the half-reaction equation at SATP conditions, with a concentration of 1.0 mol/L for the aqueous solution.

Referring to the both the definition and the diagram, what I'm wondering is: why is it necessary to have the Fe 3+ (aq) in the anode solution? It's the product of the oxidation reaction occuring there, so why is it neededthere initially ? This includes not only the particular cell shown above, but all voltaic cells. In general, why is it necessary to have the product of the half-reaction in the anode half? What function does it serve in the cell?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
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Apr27-09, 03:36 AM
Borek's Avatar
P: 23,568
Generally speaking - there is no need for products to be present initially. They will appear immediately given chance

However, at STP - by definition - activity of every reagent involved is 1.

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