electrochemistry question

[mannythemanatee]

how do you calculate Ecell? In kaplan they say its Ered + Eox, but i always learned that Ecell = Ecat - Eanode. Is kaplan wrong, or am i confusing something?

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[dat_student]

how do you calculate Ecell? In kaplan they say its Ered + Eox, but i always learned that Ecell = Ecat - Eanode. Is kaplan wrong, or am i confusing something?

if given E of reduction rxns only, you must subtract (because Eox = -Ered)
(if galvanic... subtract such that voltage is positive, [delta G = -nFE])

if given Ered and Eox, add 'em up

 

[mannythemanatee]

thanks!