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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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Chemical and Solubility Equilibria02:21

Chemical and Solubility Equilibria

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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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Vapor Pressure Lowering03:28

Vapor Pressure Lowering

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The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
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Ideal Solutions02:24

Ideal Solutions

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According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the...
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Osmosis and Osmotic Pressure of Solutions02:40

Osmosis and Osmotic Pressure of Solutions

45.8K
A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
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Solubility Equilibria03:07

Solubility Equilibria

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Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
The...
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Related Experiment Video

Updated: Jan 11, 2026

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
08:42

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

Published on: October 10, 2014

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Ion solvation under gigapascal pressure.

Zhuanfang Jing1, Toshio Yamaguchi1,2, Shinichi Machida3

  • 1Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China.

The Journal of Chemical Physics
|November 19, 2025
PubMed
Summary
This summary is machine-generated.

High pressure significantly alters ion solvation, densifying water clusters around ions and weakening hydration strength. This pressure effect impacts ion diffusion and water molecule exchange rates, particularly for structure-breaking ions.

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Area of Science:

  • Geochemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding ion solvation under extreme conditions is crucial for Earth science and chemical synthesis.
  • Gigapascal (GPa) pressures are relevant to geological processes and novel material creation.

Purpose of the Study:

  • To investigate the effects of high pressure on ion solvation in aqueous solutions.
  • To analyze changes in hydration structure, ion diffusion, and water molecule dynamics.

Main Methods:

  • Neutron scattering (NS) experiments were conducted on deuterated aqueous solutions.
  • Molecular dynamics (MD) simulations were performed for comparison.
  • Empirical potential structure refinement analyzed the NS data.

Main Results:

  • Compression to 0.7 GPa increased the density of solvated ion clusters.
  • Hydration strength decreased, and ion diffusion was suppressed, especially for structure-breaking ions.
  • Water molecule exchange rates varied: faster for Li+ and bulk water, but less affected for Na+, K+, Rb+, and Cs+.

Conclusions:

  • High pressure significantly modifies the solvation shell structure and dynamics of ions in aqueous solutions.
  • The findings provide insights into matter circulation within the Earth's interior.
  • Pressure-induced changes in hydration have implications for high-pressure chemical synthesis.