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Related Concept Videos

Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
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Solubility03:00

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
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Solution Formation02:16

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There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Solubility Equilibria: Overview

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When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
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Related Experiment Video

Updated: Dec 7, 2025

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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The solvent mediated interaction potential between solute particles: theory and applications.

Mamta Yadav1, Yashwant Singh1

  • 1Department of Physics, Banaras Hindu University, Varanasi-221005, India. mamtayadavbb@gmail.com singh.yas44@gmail.com.

Soft Matter
|October 1, 2020
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Summary

This study introduces a new theory to calculate solvent-mediated interactions between solute particles. The findings quantitatively describe how solvent fluctuations and many-body effects influence effective potentials and correlations in colloidal systems.

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Area of Science:

  • Statistical Mechanics
  • Soft Matter Physics
  • Colloid Science

Background:

  • Understanding solvent-mediated interactions is crucial for predicting the behavior of dispersed systems.
  • Existing models often simplify the complex interplay between solute and solvent particles.

Purpose of the Study:

  • To develop a theoretical framework for calculating solvent-mediated interaction potentials between solute particles.
  • To investigate the influence of solvent fluctuations and many-body effects on these potentials.

Main Methods:

  • Developed a theory expressing the interaction potential using solute-solvent direct pair correlation and bulk solvent density-density correlation functions.
  • Employed a mean-field approximation to simplify multi-point solute distribution correlations.
  • Utilized a self-consistent approach to compute effective potentials and correlation functions.

Main Results:

  • The theory provides a quantitative description of many-body effects on effective potentials and pair correlation functions.
  • Demonstrated the significance of solvent fluctuations in determining the range of effective potentials.
  • Successfully applied the theory to equilibrium properties of the Asakura-Oosawa model across various densities and size ratios.

Conclusions:

  • The developed theory offers a robust method for analyzing solvent-mediated interactions in colloidal systems.
  • Highlights the critical role of solvent dynamics and collective behavior in determining macroscopic properties.
  • Provides a foundation for further investigations into complex fluid systems.