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The predominant forms of heavy metals (Zn, Pb, Fe, Cu, Ni, etc.) in aerobic sediments are the carbonates and the oxide or hydroxide forms. An important consideration in modeling the sediment is the stable chemical form of the metal in question. Consider the reaction: AGO = 25 kJ/mol Pb(OH)₂ (s) + CO₂ (aq) ↔ PbCO3(s) + H₂O a. At what partial pressure of CO2(g) will Pb(OH)2(s) and PbCO3(s) be at equilibrium? b. If the system is at equilibrium with the atmosphere, Pco2=10-3.4 atm, calculate AG for the reaction. What is the stable form of lead in the sediments?

The predominant forms of heavy metals (Zn, Pb, Fe, Cu, Ni, etc.) in aerobic sediments are the carbonates and the oxide or hydroxide forms. An important consideration in modeling the sediment is the stable chemical form of the metal in question. Consider the reaction: AGO = 25 kJ/mol Pb(OH)₂ (s) + CO₂ (aq) ↔ PbCO3(s) + H₂O a. At what partial pressure of CO2(g) will Pb(OH)2(s) and PbCO3(s) be at equilibrium? b. If the system is at equilibrium with the atmosphere, Pco2=10-3.4 atm, calculate AG for the reaction. What is the stable form of lead in the sediments?

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter16: Thermodynamics: Directionality Of Chemical Reactions
Section: Chapter Questions
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The predominant forms of heavy metals (Zn, Pb, Fe, Cu, Ni, etc.) in aerobic sediments are the carbonates and the oxide or hydroxide forms. An important consideration in modeling the sediment is the stable chemical form of the metal in question. Consider the reaction: AGO = 25 kJ/mol Pb(OH)₂ (s) + CO₂(aq) ↔ PbCO3(s) + H₂O a. At what partial pressure of CO2(g) will Pb(OH)2(s) and PbCO3(s) be at equilibrium? b. If the system is at equilibrium with the atmosphere, Pco2-10-3.4 atm, calculate AG for the reaction. What is the stable form of lead in the sediments?
Transcribed Image Text:The predominant forms of heavy metals (Zn, Pb, Fe, Cu, Ni, etc.) in aerobic sediments are the carbonates and the oxide or hydroxide forms. An important consideration in modeling the sediment is the stable chemical form of the metal in question. Consider the reaction: AGO = 25 kJ/mol Pb(OH)₂ (s) + CO₂(aq) ↔ PbCO3(s) + H₂O a. At what partial pressure of CO2(g) will Pb(OH)2(s) and PbCO3(s) be at equilibrium? b. If the system is at equilibrium with the atmosphere, Pco2-10-3.4 atm, calculate AG for the reaction. What is the stable form of lead in the sediments?
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