Define the standard and formal reduction potentia values of redox couples and explain their difference.
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If any change of the potential will lead to a change of the direction of the reaction, i.e. from reduction to oxidation or vice versa, the system is at its formal potential. If the formal potential is measured under standard conditions (activity of all components is 1, 298,15 K, 1 bar) it is called standard potential.
A formal potential is the reduction potential that applies to a half reaction under a specified set of conditions
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