GIVEN:Compare the solubility of ferrihydrite (Fe(OH)3) and goethite (FeOOH).Dissolution Reactions:(A) Fe(OH)3 3 H+ à Fe3+ + 3 H2O with Ksp = 8.8 x 10^4 ΔGr = -28 KJ/mol(B) FeOOH + 3 H+ à Fe3+ + 2 H2O with Ksp = 8.8 x 10^-2 ΔGr = 6 KJ/mol ΔGo (KJ/mol):Fe(OH)3 = -692FeOOH = -489H+ = 0Fe3+ = -9H2O = -237 QUESTION: How much Fe3+ from ferrihydrite would dissolve at pH 2 and 7? How much Fe3+ from goethite would dissolve at pH 2 and 7? AG° (KJ/mol):Fe(OH); = -692FEOOH = -489H* = 0Fe3+ = -9H2O = -237 Dissolution Reactions:(А)Fe(OH); 3 H* → Fe3+ + 3 H2O withKp = 8.8 x 10^4AGr = -28 KJ/mol(В)FEOOH + 3 H* → Fe3+ + 2 H2O with Ksp = 8.8 x 10^-2KepAGr = 6 KJ/mol

Dissolution Reactions: (A) Fe(OH)3 + 3 H+ ------> Fe3+ + 3 H2O given, Ksp = 8.8 x 10^4 , ΔGr = -28 KJ/mol (B) FeOOH + 3 H+ -----> Fe3+ + 2H2O given, Ksp = 8.8 x 10^-2, ΔGr = 6 KJ/mol. We have to Compare the solubility of ferrihydrite (Fe(OH)3) and goethite (FeOOH).

Answered: Compare the solubility of ferrihydrite…

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

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GIVEN:

Compare the solubility of ferrihydrite (Fe(OH)₃) and goethite (FeOOH).

Dissolution Reactions:

(A) Fe(OH)₃ 3 H⁺ à Fe³⁺ + 3 H₂O with K_sp = 8.8 x 10^4 ΔGr = -28 KJ/mol

(B) FeOOH + 3 H⁺ à Fe³⁺ + 2 H₂O with K_sp = 8.8 x 10^-2 ΔGr = 6 KJ/mol

ΔG^o (KJ/mol):

Fe(OH)₃ = -692

FeOOH = -489

H⁺ = 0

Fe³⁺ = -9

H₂O = -237

QUESTION: How much Fe³⁺ from ferrihydrite would dissolve at pH 2 and 7? How much Fe³⁺ from goethite would dissolve at pH 2 and 7?

AG° (KJ/mol):
Fe(OH); = -692
FEOOH = -489
H* = 0
Fe3+ = -9
H2O = -237

Dissolution Reactions:
(А)
Fe(OH); 3 H* → Fe3+ + 3 H2O with
Kp = 8.8 x 10^4
AGr = -28 KJ/mol
(В)
FEOOH + 3 H* → Fe3+ + 2 H2O with Ksp = 8.8 x 10^-2
Kep
AGr = 6 KJ/mol

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