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Related Concept Videos

Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Ionic Strength: Effects on Chemical Equilibria01:19

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
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Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
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Introduction to Electrolytes01:33

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In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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Electrical Conductivity

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In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
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Fluctuation-enhanced electric conductivity in electrolyte solutions.

Jean-Philippe Péraud1, Andrew J Nonaka1, John B Bell2

  • 1Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94703.

Proceedings of the National Academy of Sciences of the United States of America
|October 5, 2017
PubMed
Summary

An applied electric field enhances charge transport in binary electrolyte fluids through thermal fluctuations. This study reveals a new electrodiffusion mechanism and predicts a cation-anion diffusion coefficient matching experimental data.

Keywords:
Navier–Stokes equationsNernst–Plank equationselectrohydrodynamicsfluctuating hydrodynamicsmulticomponent diffusion

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Area of Science:

  • Physical Chemistry
  • Fluid Dynamics
  • Electrolyte Theory

Background:

  • Understanding electrolyte behavior under external fields is crucial for applications.
  • Thermal fluctuations significantly impact transport phenomena in fluids.
  • Existing models may not fully capture complex interactions in charged fluids.

Purpose of the Study:

  • To investigate the influence of electric fields on thermal fluctuations in binary electrolytes.
  • To elucidate the mechanisms of enhanced charge and mass transport.
  • To develop a more comprehensive theoretical framework for electrolyte dynamics.

Main Methods:

  • Analysis of fluctuating Poisson-Nernst-Planck (PNP) equations coupled with fluid momentum equations.
  • Application of fluctuating hydrodynamics approach.
  • Comparison of theoretical predictions with experimental measurements.

Main Results:

  • Identified a novel mechanism for enhanced charge transport distinct from giant fluctuations.
  • Predicted a nonzero cation-anion Maxwell-Stefan coefficient proportional to the square root of salt concentration, matching experiments.
  • Demonstrated that renormalized macroscopic equations differ from classical PNP equations, except in the dilute limit.

Conclusions:

  • Fluctuating hydrodynamics provides a consistent framework for electrolyte transport, recovering known corrections and offering physical insights.
  • The study generalizes findings to complex multispecies electrolytes.
  • Strong electric fields induce anisotropic velocity fluctuations and suppress salt concentration fluctuations.