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Yiwei Zhou 2I
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Postby Yiwei Zhou 2I » Wed Feb 21, 2018 12:30 pm

14.25 Arrange the following metals in order of increasing strength as reducing agents for species in aqueous solution: (a) Cu, Zn, Cr, Fe; (b) Li, Na, K, Mg; (c) U, V, Ti, Al; (d) Ni, Sn, Au, Ag

When we compare the standard reduction potential of Cu, which data should we use? Why?

(Cu+) + (e-) = Cu +0.52
(Cu2+) + (2e-) = Cu +0.34

(the standard reduction potential of Fe also varies)

Thanks a lot!

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Re: TEXTBOOK 14.25

Postby Chem_Mod » Wed Feb 21, 2018 3:28 pm

You should use a reaction that is seen in all of the species listed. For part a), Copper, Chromium and Iron do present different reactions and consequently different reduction potentials; however, there is only one reduction potential listed for Zinc. Thus, you should choose reactions similar in structure to compare the four, meaning the loss of 2 electrons.

Katherine Jordak 1H
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Re: TEXTBOOK 14.25

Postby Katherine Jordak 1H » Wed Feb 21, 2018 7:47 pm

Choosing reactions of the same structure only works in part a. How am I supposed to know what data to use when there isn't a reaction structure in common for all of the elements?

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