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Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Redox Titration: Overview01:21

Redox Titration: Overview

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Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
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Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Redox Equilibria: Overview01:23

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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The Nernst Equation02:59

The Nernst Equation

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Nonstandard Reaction Conditions
The interconnection between standard cell potentials and various thermodynamic parameters such as the standard free energy change ΔG° and equilibrium constant K has been previously explored. For example, a redox reaction involving zinc(II) and tin(II) ions at 1 M concentration with Eºcell = +0.291 V and ΔG° = −56.2 kJ is spontaneous.
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Predicting laterite redox potential with iron activity and electron transfer term.

Yanping Ji1, Jiang Xu1, Lizhong Zhu1

  • 1College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, 310058, China.

Chemosphere
|March 27, 2023
PubMed
Summary

Accurate soil redox potential (Eh) prediction is crucial for environmental remediation. This study developed a new model integrating iron activity, significantly improving Eh prediction in complex soils like laterites.

Keywords:
Electron transferIron activityIron speciationLateriteModelingRedox potentialSoil remediation

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Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry CE-ICP-MS for Quantification of Iron Redox Species FeII, FeIII
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Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Geochemistry

Background:

  • Predicting soil redox potential (Eh) is vital for understanding contaminant behavior.
  • Existing Eh models often fail for complex soils, particularly laterites with low Fe(II).

Purpose of the Study:

  • To develop an improved soil redox potential (Eh) model for complex lateritic soils.
  • To accurately predict Eh by integrating iron activity into the Nernst formula.

Main Methods:

  • Measured Eh in 2450 simulated laterite tests under varying soil conditions.
  • Quantified impacts of pH, organic carbon, and Fe speciation on Fe activity.
  • Utilized a two-step Universal Global Optimization method.

Main Results:

  • The developed model, integrating Fe activity coefficients, significantly improved Eh prediction (R²=0.92).
  • Estimated Eh values closely matched measured values (accuracy R²=0.93).
  • Model validation with natural laterites showed strong linear fit and accuracy (R²=0.89 and 0.86).

Conclusions:

  • Integrating Fe activity into the Nernst formula provides accurate Eh calculations, especially when the Fe(III)/Fe(II) couple is insufficient.
  • The model aids in predicting soil Eh for controlled oxidation-reduction of contaminants in soil remediation.