Fe3+^{3+}3+/Fe2+^{2+}2+ (E∘=0,771E^\circ=0{,}771E∘=0,771 V): finn EEE når [Fe3+]=0,010[Fe^{3+}]=0{,}010[Fe3+]=0,010 M, [Fe2+]=0,100[Fe^{2+}]=0{,}100[Fe2+]=0,100 M.
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E=0,771−0,05916log(0,100/0,010)=0,712E = 0{,}771 - 0{,}05916\log(0{,}100/0{,}010) = 0{,}712E=0,771−0,05916log(0,100/0,010)=0,712 V.
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