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Solubility03:00

Solubility

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).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Liquid–Solid Solutions01:29

Liquid–Solid Solutions

The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
Entropy and Solvation02:05

Entropy and Solvation

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 ≥ 15); an...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
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Solution Formation

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 solubility...

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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Published on: September 4, 2015

Diferenciar los mecanismos de solvación en las interfaces sólido/líquido polares.

Michael R Brindza1, Robert A Walker

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.

Journal of the American Chemical Society
|April 16, 2009
PubMed
Resumen

La segunda generación armónica mejorada por resonancia revela cómo los disolventes interactúan con las superficies de sílice. Las interacciones específicas del disolvente dependen de las propiedades de la superficie, no solo del tipo de disolvente, lo que ofrece información sobre los mecanismos de solvación interfacial.

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Área de la Ciencia:

  • Química Física es la química física.
  • Ciencias de la superficie Ciencias de la superficie.
  • La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

  • Los mecanismos de disolución en las interfaces sólido/líquido son cruciales para la comprensión de los fenómenos interfaciales.
  • La solvación interfacial puede ser inespecífica (promediada) o específica (localizada, direccional).
  • Se necesitan técnicas espectroscópicas para diferenciar estos mecanismos en las interfaces.

Objetivo del estudio:

  • Identificar y caracterizar los mecanismos de solvación en las interfaces de sílice y solventes orgánicos.
  • Para distinguir entre las interacciones de solvatación no específicas y específicas.
  • Comprender el papel de la polaridad interfacial y el enlace de hidrógeno.

Principales métodos:

  • Se empleó espectroscopia de segunda generación armónica (SHG) mejorada por resonancia.
  • Los espectros de SHG se utilizaron para sondear la estructura electrónica de los solutos adsorbidos.
  • Los cálculos ab initio modelaron las interacciones de solvación masiva.

Principales resultados:

  • La polaridad interfacial, probada por p-nitroanisol, es sensible a la estructura del disolvente.
  • Las interacciones de enlace de hidrógeno, probadas por indolina, son insensibles a la identidad del disolvente.
  • El enlace de hidrógeno está dominado por las propiedades del sustrato de sílice.

Conclusiones:

  • Los mecanismos de disolución en las superficies sólidas polares son complejos y dependen tanto del soluto como del sustrato.
  • SHG es eficaz en la diferenciación de los comportamientos de solvación interfacial.
  • Los enfoques experimentales y computacionales combinados proporcionan una visión integral de la solvación interfacial.