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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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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
15.0K
Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

957
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
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Introduction to Electrolytes01:33

Introduction to Electrolytes

12.6K
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.
Role of Sodium
One...
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Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

61.7K
Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
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Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.7K
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.
In this solution, the primary...
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Related Experiment Video

Updated: Sep 12, 2025

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
08:41

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

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A new perspective on aqueous electrolyte solutions.

Gerhard Schwaab1, Simone Pezzotti1

  • 1Department of Physical Chemistry II, Ruhr-University Bochum, Bochum, Germany. gerhard.schwaab@rub.de.

Physical Chemistry Chemical Physics : PCCP
|August 6, 2025
PubMed
Summary

A new coarse-grained statistical approach models aqueous electrolyte solutions by analyzing a central volume and its environment. This method accurately predicts thermodynamic properties without needing ion pair data, simplifying complex solution analysis.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Aqueous electrolyte solutions are crucial in nature and industry, driving the need for advanced analytical models.
  • Current atomistic and mean-field models struggle with ion-ion correlations and specific solvation in concentrated solutions.

Purpose of the Study:

  • To introduce a novel statistical, coarse-grained approach for describing the average thermodynamic properties of aqueous electrolyte solutions.
  • To overcome limitations of existing models in handling concentrated solutions and specific ion effects.

Main Methods:

  • A statistical, coarse-grained model is proposed, focusing on a spherical observation volume and its surrounding environment.
  • The model utilizes a generalized multipole expansion for volume-environment interactions, enabling an additive description.
  • No prior knowledge of ion pairs, ion complexes, or specific solvation is required.

Main Results:

  • The approach was successfully applied to 135 diverse electrolytes, including challenging species like LiCl and ZnCl2, across their full solubility ranges.
  • The method provides accurate predictions of average thermodynamic properties for concentrated electrolyte solutions.
  • The model offers a new perspective for understanding phenomena like super-saturated solutions and water-in-salt solutions.

Conclusions:

  • This coarse-grained statistical method offers a powerful and simplified alternative for modeling aqueous electrolyte solutions.
  • It provides a foundation for understanding complex phenomena in highly concentrated electrolytes and electrolyte nucleation.
  • The approach facilitates the development of more robust predictive models for electrolyte behavior.