(a) Draw the potential- pH diagram for the three species Co2+ (aq), Co(OH)2 and Co(s) at 25°C and 1 atmosphere total pressure. Show also the equilibrium line between H₂ (gas) at 1 atmosphere and water. Give the equations of all the lines involved. Concentration of Co2+ = 10-3 mole litre-1. Use the following standard free energies of formation:- Species Co2+ (aq) Co(OH)2 (s) H₂O (1) OH- H+ Co H₂ A Go (kJ mol-¹) - 0 0 0 53.5 456 237 157.0 (b) Use the diagram to answer the following questions: (i) By comparing the Fe-H₂O and Co-H₂O systems, explain the best way to remove iron from coba leach liquor in a cobalt purification circuit.
(a) Draw the potential- pH diagram for the three species Co2+ (aq), Co(OH)2 and Co(s) at 25°C and 1 atmosphere total pressure. Show also the equilibrium line between H₂ (gas) at 1 atmosphere and water. Give the equations of all the lines involved. Concentration of Co2+ = 10-3 mole litre-1. Use the following standard free energies of formation:- Species Co2+ (aq) Co(OH)2 (s) H₂O (1) OH- H+ Co H₂ A Go (kJ mol-¹) - 0 0 0 53.5 456 237 157.0 (b) Use the diagram to answer the following questions: (i) By comparing the Fe-H₂O and Co-H₂O systems, explain the best way to remove iron from coba leach liquor in a cobalt purification circuit.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:(a) Draw the potential- pH diagram for the three species Co2 (aq), Co(OH)2 and Co(s) at 25°C and 1
atmosphere total pressure. Show also the equilibrium line between H2 (gas) at 1 atmosphere and water. Give
the equations of all the lines involved.
Concentration of Co2+ = 10-3 mole litre-1.
Species
Co2* (aq)
Co(OH)2 (s)
H20 (1)
Use the following standard free energies of formation:-
A Go (kJ mol-1)
53.5
456
237
157.0
OH-
H+
Co
H2
(b) Use the diagram to answer the following questions:
(i) By comparing the Fe-H20 and Co-H2O systems, explain the best way to remove iron from coba
leach liquor in a cobalt purification circuit.
IO O O
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