Research has been conducted on molybdates as replacements for chromates in the surface treatment of various metals in order to reduce corrosion by the formation of a surface film of MoO,. The overall reaction with iron is 2Fe(s) + 3M00; (aq) + 6H*(aq) → Fe;Os(s) + 3M0O:(s) + 3H;0() Given the following AG; in calories per mole at 25°C: Fe,O; (s) =-177,100, MoO:(s) = -120,000, H;O (1) =-56,690, Mo0; (aq) --205,420 (a) Is the above overall reaction spontaneous under standard conditions? (b) Calculate the standard electrode potential for the above overall reaction. (c) Write an expression for the electrode potential as a function of molybdate ion concentration and pH.
Research has been conducted on molybdates as replacements for chromates in the surface treatment of various metals in order to reduce corrosion by the formation of a surface film of MoO,. The overall reaction with iron is 2Fe(s) + 3M00; (aq) + 6H*(aq) → Fe;Os(s) + 3M0O:(s) + 3H;0() Given the following AG; in calories per mole at 25°C: Fe,O; (s) =-177,100, MoO:(s) = -120,000, H;O (1) =-56,690, Mo0; (aq) --205,420 (a) Is the above overall reaction spontaneous under standard conditions? (b) Calculate the standard electrode potential for the above overall reaction. (c) Write an expression for the electrode potential as a function of molybdate ion concentration and pH.
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
Chapter17: Electrochemistry
Section: Chapter Questions
Problem 88AP
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![Research has been conducted on molybdates as replacements for chromates in the
surface treatment of various metals in order to reduce corrosion by the formation of
a surface film of MoO,. The overall reaction with iron is
2Fe(s) + 3M00- (aq) + 6H*(aq) - Fe;Os(s) + 3M0O:(s) + 3H;O()
Given the following AG; in calories per mole at 25°C:
Fe,O; (s) =-177,100,
MoO:(s) =-120,000,
H:O (1) =-56,690,
Mo0; (aq) =-205,420
(a) Is the above overall reaction spontaneous under standard conditions?
(b) Calculate the standard electrode potential for the above overall reaction.
(c) Write an expression for the electrode potential as a function of molybdate ion
concentration and pH.
(d) Is the overall reaction spontaneous for a molybdate ion concentration of
0.001M at pH 7.0?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F68ea07c0-0e52-4f4a-9378-6837dae2950d%2F0de29be7-88cb-4ec5-993d-88fe9b3f0eff%2Fqjalde_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Research has been conducted on molybdates as replacements for chromates in the
surface treatment of various metals in order to reduce corrosion by the formation of
a surface film of MoO,. The overall reaction with iron is
2Fe(s) + 3M00- (aq) + 6H*(aq) - Fe;Os(s) + 3M0O:(s) + 3H;O()
Given the following AG; in calories per mole at 25°C:
Fe,O; (s) =-177,100,
MoO:(s) =-120,000,
H:O (1) =-56,690,
Mo0; (aq) =-205,420
(a) Is the above overall reaction spontaneous under standard conditions?
(b) Calculate the standard electrode potential for the above overall reaction.
(c) Write an expression for the electrode potential as a function of molybdate ion
concentration and pH.
(d) Is the overall reaction spontaneous for a molybdate ion concentration of
0.001M at pH 7.0?
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