Redox reactions and PMF

Question 1

What is the chemical potential?

Answer 1

The chemical potential difference tells us how much ΔG will be lost per mole of substance that goes from state A to state B
µ(A)=µ0’(A)+RT*ln[A]

Question 2

How can chemical potential change depending on the type of transport/reaction/molecules we are considering?

Answer 2

1. Diffusion:
   Δµ=Δµ(final) - Δµ(initial) = Δµ0’+RT*ln([A(final)]/[A(initial)])
2. Reactions:
   Δµ(AB)=Δµ0’(AB)+RTln([B]/[A])
   if Δµ(AB)=0 –> Δµ0’(AB)=-RTln(Keq)
3. Charged molecules:
   µ=zFΔψ

The combination of the two components form the proton motive force:
pmf=zFΔψ+RT*ln([H(in)]/[H(out)])

Question 3

What are redox reactions?

Answer 3

Redox reactions are reactions in which electrons are being transferred from one molecule to another.

1. Reduction: uptake of electrons
2. Oxidation: removal of electrons

Question 4

What is the redox potential? What is its relation to the chemical one?

Answer 4

The redox potential is the chemical potential in redox reactions.

  ΔE=ΔE0'+(RT/zF)*ln{([Aox][Dred])/([Ared][Dox}

Question 5

What is the Redox state?

Answer 5

The redox state is the measure of the degree of oxidation of an atom in a chemical compound, thus is the hypothetical charge that an atom would have if all bonds were 100% ionic