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=10-34 atm, calculate AG for the reaction. What is the stable form of lead in the sediments?

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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:

\[ \text{Pb(OH)}_2(s) + \text{CO}_2(aq) \leftrightarrow \text{PbCO}_3(s) + \text{H}_2\text{O} \quad \Delta G^0 = 25 \, \text{kJ/mol} \]

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a. At what partial pressure of CO\(_2\)(g) will Pb(OH)\(_2\)(s) and PbCO\(_3\)(s) be at equilibrium?

b. If the system is at equilibrium with the atmosphere, \( P_{\text{CO}_2} = 10^{-3.4} \) atm, calculate \(\Delta G\) for the reaction. What is the stable form of lead in the sediments?
Transcribed Image Text:**Text for Educational Website:** 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: \[ \text{Pb(OH)}_2(s) + \text{CO}_2(aq) \leftrightarrow \text{PbCO}_3(s) + \text{H}_2\text{O} \quad \Delta G^0 = 25 \, \text{kJ/mol} \] Questions: a. At what partial pressure of CO\(_2\)(g) will Pb(OH)\(_2\)(s) and PbCO\(_3\)(s) be at equilibrium? b. If the system is at equilibrium with the atmosphere, \( P_{\text{CO}_2} = 10^{-3.4} \) atm, calculate \(\Delta G\) for the reaction. What is the stable form of lead in the sediments?
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