Make a short electrochemical series (it should contain 4 half reactions with the

Question

Make a short electrochemical series (it should contain 4 half reactions with the strongest oxidizing agent listed at the top) for Li, Ca, Rb, and Sr given the following experimental data: 2 Cs + Sr^2+ rightarrow Sr + 2 Cs Rb + Cs rightarrow no reaction Li + Cs^+ rightarrow Li^+ + Cs Rb^+ + Sr rightarrow no reactions A zinc copper battery is constructed as follows at 25 V. Calculate the cell potential after 10.0 A of current has flowed for 10.0 b. (Assume each half-cell contains 1.00 L of solution.)

Explanation / Answer

18 )

form the reactions : redctuion potential increase in order for elements : Li < Cs < Rb < Sr.

highest reduction potential element can act as a strong oxidizing agent.

so oxidizing agent order : Sr+2 > Rb+ > Cs+ > Li+

reducing agent capacity : Li > Cs > Rb > Sr

19)

standard reduction potential :

Eo cathode - Eo anode = 0.34 - (-0.76) = 1.10 V

Zn + Cu+2 ----------------------->Zn+2 + Cu

Ecell = Eo - 0.0591 / n * log [Zn+2]/[Cu+2]

= 1.10 - 0.05916 / 2 * log [0.10 /2.50]

= 1.14 V

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