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Entropy and Solvation02:05

Entropy and Solvation

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Energetics of Solution Formation02:35

Energetics of Solution Formation

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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.
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. Formation of the solution requires the solute–solute and solvent–solvent...
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Solution Formation02:16

Solution Formation

31.5K
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.
This selective...
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Solubility Equilibria: Overview01:09

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.
Solubility is important in biological and environmental processes. A notable...
667
Chemical and Solubility Equilibria02:21

Chemical and Solubility Equilibria

4.1K
The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if  ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
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Enthalpy of Solution02:39

Enthalpy of Solution

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There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
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Updated: Jul 2, 2025

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Solvation Thermodynamics and Its Applications.

Arieh Ben-Naim1

  • 1Department of Physical Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel.

Entropy (Basel, Switzerland)
|February 23, 2024
PubMed
Summary

This study introduces a new definition for solvation processes and thermodynamic quantities, offering a simpler molecular interpretation and practical advantages over older measures.

Keywords:
Gibbs energy of solvationsolvationthermodynamics

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Area of Science:

  • Physical Chemistry
  • Thermodynamics
  • Solution Chemistry

Background:

  • Traditional definitions of solvation processes, used until the 1980s, lacked a clear molecular interpretation.
  • Existing measures of thermodynamic quantities in solvation lack simplicity and broad applicability.

Purpose of the Study:

  • To propose a novel, molecularly interpretable definition of solvation processes.
  • To introduce a new measure for solvation Gibbs energy with enhanced interpretability.
  • To highlight the advantages of the new thermodynamic quantities for solvation processes.

Main Methods:

  • Review and critique of historical solvation process definitions.
  • Development of a new definition based on molecular interpretation.
  • Analysis of the thermodynamic quantities associated with the new solvation definition.

Main Results:

  • A new definition of the solvation process with a simple molecular interpretation has been established.
  • The new measure of solvation Gibbs energy offers straightforward interpretation.
  • The proposed thermodynamic quantities present several advantages over previous measures.

Conclusions:

  • The new definition provides a more intuitive understanding of solvation.
  • The revised thermodynamic quantities offer improved utility in chemical research.
  • The study paves the way for new applications in understanding solvation phenomena.