The inherent tendency, measured in volts under standard conditions, of a compound to donate or to accept electrons:
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In biochemistry, the redox potential is a measure of the chemical energy that is released during a process. NADH, for example, has a more negative redox potential than FADH2, so more ATP can be obtained with NADH. BUT: What is the strength of the redox potential? I have read that this is related to the energy of the given electron. This can not be? If the energy of an electron in the outer shells is higher, shouldn't lithium have a weaker electron potential than lead?
Adi S.
Fluorine and Chlorine The halogen oxides and oxoanions are good oxidizing agents. For example, the reduction of bromate ion has an $E^{\circ}$ value of $1.44 \mathrm{V}$ in acid solution: $$2 \mathrm{BrO}_{3}^{-}(\mathrm{aq})+12 \mathrm{H}^{+}(\mathrm{aq})+10 \mathrm{e}^{-} \longrightarrow \mathrm{Br}_{2}(\mathrm{aq})+6 \mathrm{H}_{2} \mathrm{O}(\ell)$$
Reduction potentials for common redox couples Redox couple Eo (volts) 2 H+ + 2e- → H2 -0.42 Ferredoxin (Fe3+) + e- → Ferredoxin (Fe2+) -0.42 NAD+ + H+ + 2e- → NADH -0.32 NADP+ + H+ + 2e- → NADPH -0.32 S + 2 H+ + 2e- → H2S -0.28 Acetaldehyde + 2 H+ + 2e- → Ethanol -0.2 Pyruvate- + 2 H+ + 2e- → Lactate2- -0.19 FAD + 2 H+ + 2e- → FADH2 -0.18 Oxaloacetate2- + 2 H+ + 2e- → Malate2- -0.166 Fumarate2- + 2 H+ + 2e- → Succinate2- -0.031 Cytochrome b (Fe3+) + e- → Cytochrome b (Fe2+) -0.075 Ubiquinone + 2 H+ + 2e- → Ubiquinone H2 +0.100 Cytochrome c (Fe3+) + e- → Cytochrome c (Fe2+) +0.254 Cytochrome a (Fe3+) + e- → Cytochrome a (Fe2+) +0.29 NO3- + 2 H+ + 2e- → NO2- + H2O +0.42 NO2- + 8 H+ + 6e- → NH4+ + 2 H2O +0.44 Fe3+ + e- → Fe2+ +0.77 ½ O2 + 2 H+ + 2e- → H2O +0.82
Shaiju T.
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