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QUESTION: Use thermodynamic calculations [use redox potential (Eh)] to predict which of the three reductants below is most favorable at pH 3 ?

QUESTION: Use thermodynamic calculations [use redox potential (Eh)] to predict which of the three reductants below is most favorable at pH 3 ?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Given A, B, and C…

[A]    U(VI) as uraninite; UO2 (where Fe2+= reductant; Fe(OH)3 ferrihydrite= product):

2Fe2+ + UO22+ +3H2O + H+  ---- > 2Fe(OH)3 + U4+ +2H2O

 

[B]   U(VI) as uraninite; UO2 (where Mn2+= reductant; MnO2 pyrolusite= product):

2H2O + UO22+ + Mn2+  ---- > UO2 + B - MnO2  + 4H+  

 

[C]   U(VI) as as uraninite; UO2 (where HS-= reductant; S0= product):

UO22+ + Hs-  ---- > UO2 + S + H+   

QUESTION: Use thermodynamic calculations [use redox potential (Eh)] to predict which of the three reductants below is most favorable at pH 3 ?

(1)        Fe2+

(2)        Mn2+

(3)        HS-

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