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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+...

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...

Redox Equilibria: Overview

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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...

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...

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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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Related Experiment Video

Updated: Apr 6, 2026

Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers

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Predicting Redox Conditions in Groundwater at a Regional Scale.

Anthony J Tesoriero¹, Silvia Terziotti², Daniel B Abrams³

¹†USGS, 2130 SW Fifth Avenue, Portland, Oregon 97201, United States.

Environmental Science & Technology

|August 1, 2015

Summary

Understanding the oxic-suboxic interface is key for predicting groundwater and stream nitrate transport. This study maps oxic groundwater probability in the Chesapeake Bay watershed, aiding in assessing groundwater and stream susceptibility to contaminants.

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Area of Science:

Environmental Science
Hydrogeology
Geochemistry

Background:

The oxic-suboxic interface critically influences nitrate transport in groundwater and streams.
Regional-scale definition is challenging due to variable reaction rates.

Purpose of the Study:

Predict the probability of oxic groundwater across the Chesapeake Bay watershed.
Assess the influence of oxic groundwater depth on stream nitrate concentrations and time lags.

Main Methods:

Used logistic regression to relate dissolved oxygen in groundwater to residence time and electron donor availability.
Incorporated surficial geology, flow system position, and soil drainage as predictive variables.
Developed regional probability maps for oxic groundwater at 30m depth and the oxic layer's bottom depth.

Main Results:

Surficial geology, flow system position, and soil drainage significantly predict oxic groundwater presence.
Predicted the probability of oxic groundwater and the depth to the oxic-suboxic interface regionally.
Model simulations illustrated the impact of oxic layer depth on stream nitrate and nitrogen time lags.

Conclusions:

Regional maps of oxic groundwater probability serve as valuable indicators.
These maps help assess groundwater and stream susceptibility to groundwater-derived contaminants.
Understanding the oxic-suboxic interface is crucial for managing water quality.