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Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests

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Evaluation of interfacial equilibrium constants from surface potential data: silver chloride aqueous interface.

Tajana Preocanin¹, Filip Supljika, Nikola Kallay

¹Laboratory of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia. tajana@chem.pmf.hr

Journal of Colloid and Interface Science

|July 4, 2009

Summary

This study measured the inner surface potential of silver chloride electrodes in various electrolyte solutions. The surface potential was found to be linear and largely independent of ionic strength, supporting a surface complexation model.

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Dynamic Electrochemical Measurement of Chloride Ions

Dynamic Electrochemical Measurement of Chloride Ions

Published on: February 5, 2016

Area of Science:

Electrochemistry
Surface Chemistry
Materials Science

Background:

Understanding the silver chloride aqueous electrolyte interface is crucial for electrochemical applications.
Previous studies have not fully elucidated the behavior of inner surface potential (Psi(0)) as a function of chloride ion activity.
The point of zero charge (pzc) is a key parameter for interpreting surface potential measurements.

Purpose of the Study:

To measure the inner surface potential (Psi(0)) at the silver chloride aqueous electrolyte interface.
To investigate the influence of chloride ion activity and various electrolytes (Li, Na, Cs, Mg, La nitrates) on Psi(0).
To evaluate the applicability of the surface complexation model for silver chloride interfaces.

Main Methods:

Utilized a single crystal silver chloride electrode (SCr-AgCl) to measure Psi(0).
Determined chloride ion activity using a Ag/AgCl electrode.
Calculated absolute surface potential values using the point of zero charge (pCl(pzc)=5.2).

Main Results:

The Psi(0) (pCl) function exhibited a linear relationship within experimental error.
Psi(0) was practically identical across all tested electrolytes and largely independent of ionic strength.
The reduction of the slope (alpha coefficient) varied slightly with ionic strength, ranging from 0.84 to 0.88.
Equilibrium constants for chloride (lg K(o)(n)=2.67) and silver ion (lg K(o)(p)=2.07) binding were evaluated.
Counterion surface association constants (lg K(o)(NO3(-))=lg K(o)(K+)=2.74) were also determined.

Conclusions:

The experimental results align well with the surface complexation model adapted for silver chloride.
The study provides quantitative equilibrium constants for ion binding at the silver chloride surface.
The findings offer valuable insights into the electrochemical behavior of silver chloride interfaces.