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Given below (c): Standard gibb's free energies (∆Gf0  kJ mol-1 ): UO2 = -962.7 UO22+  =  -953.5 U4+  = -579.1               Fe2+ = -78.9 Fe(OH)3 ferrihydrite = -692.07 Mn2+  = -288.1 MnO2 pyrolusite  = -465.1 HS- = 12.1 H+ = 0 H2O = -237.1 S0  = 0   Given: U(VI) as uraninite; UO2 (where Mn2+ = reductant; MnO2 pyrolusite = product): ∆ Gr0 = -21.3 KJ/mol E0 (emf) = 0.110 V n = 2 F = 96.42   QUESTION: Calculate Eh equation below to calculate at different pH: – Eh = E0 + (RT/nF) * lnK For U(VI) as uraninite; UO2 (where HS- = reductant; S0 = product): UO22+ + Hs-  ---- > UO2 + S + H+      [A] pH 3 [B] pH 7

Given below (c): Standard gibb's free energies (∆Gf0  kJ mol-1 ): UO2 = -962.7 UO22+  =  -953.5 U4+  = -579.1               Fe2+ = -78.9 Fe(OH)3 ferrihydrite = -692.07 Mn2+  = -288.1 MnO2 pyrolusite  = -465.1 HS- = 12.1 H+ = 0 H2O = -237.1 S0  = 0   Given: U(VI) as uraninite; UO2 (where Mn2+ = reductant; MnO2 pyrolusite = product): ∆ Gr0 = -21.3 KJ/mol E0 (emf) = 0.110 V n = 2 F = 96.42   QUESTION: Calculate Eh equation below to calculate at different pH: – Eh = E0 + (RT/nF) * lnK For U(VI) as uraninite; UO2 (where HS- = reductant; S0 = product): UO22+ + Hs-  ---- > UO2 + S + H+      [A] pH 3 [B] pH 7

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter22: Inorganic Materials
Section: Chapter Questions
Problem 19P
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Given below (c):

Standard gibb's free energies (∆Gf0  kJ mol-1 ):

UO2 = -962.7

UO22+  =  -953.5

U4+  = -579.1              

Fe2+ = -78.9

Fe(OH)3 ferrihydrite = -692.07

Mn2+  = -288.1

MnO2 pyrolusite  = -465.1

HS- = 12.1

H+ = 0

H2O = -237.1

S0  = 0

 

Given:

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

∆ Gr0 = -21.3 KJ/mol

E0 (emf) = 0.110 V

n = 2

F = 96.42

 

QUESTION:

Calculate Eh equation below to calculate at different pH:

– Eh = E0 + (RT/nF) * lnK

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

UO22+ + Hs-  ---- > UO2 + S + H+   

 

[A] pH 3

[B] pH 7

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