20: Electrochemistry

Chapter 20 Reflection

I have learnt the following:

There are two methods that can be used to fins out whether a reaction is feasible:

• Without calculation: Identify the reduction reaction which has a more positive SEP value and identify the SOA and SRA.

• With calculation: Determine which reaction will be forward or backward (change sign) through the previously mentioned method and add the SEP values together. If the sum is +, the reaction is feasible.

1. When the experiment is not conducted under standard conditions (change in conc), the change in EP will be determined by the LCP.

2. However, the prediction is only valid then the SEP difference is above 0.30 V. In this case, the Nernst Equation can be used to calculate the SEP.

3. There are two forms of the equation. However, the latter, simplified version can only be used when the temperature is 298K.

4. The SEP and Gibbs Free Energy can be related in the following equation: delta G = -nF(E cell).

5. When both E cell is positive, delta G must be negative, so the reaction is feasible.
   

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