Deduce Feasibility of Redox Reaction

In this JC2 webinar we want to deduce the feasibility of the following redox reaction and state its observations:

The reactants are pretty straightforward - Fe³⁺ and I^- ions.

First we need to determine which species undergo oxidation and reduction.

Fe³⁺ can only be reduced so we will consider the reduction of Fe³⁺ to Fe²⁺.

We can find the relevant half equation from the Data Booklet and since Fe³⁺ is reduced, it should be found on the left hand side of the half equation.

I^- can only be oxidised so we will consider the oxidation of I^- to I₂.

Since I^- is oxidised it should be found on the right hand side of the half equation.

We can now calculate the E_cell for the redox reaction where Fe³⁺ is reduced and I^- is oxidised.

Since E_cell is positive, the redox reaction is feasible and we expect the reaction to occur.

We can then write out the observations based on the colours and physical states of the reactants and products.

Reactants:

Fe³⁺(aq) = yellow solution
I^-(aq) = colourless solution

Initial observation = yellow solution

Products:

Fe²⁺(aq) = green solution
I₂(aq) = brown solution or I₂(s) = black crystals

Final observation = green solution with black crystals or brown solution

Topic: Electrochemistry, Physical Chemistry, A Level Chemistry, Singapore

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