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Related Concept Videos

Ions as Acids and Bases02:54

Ions as Acids and Bases

Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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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...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:

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Total Internal Reflection Absorption Spectroscopy (TIRAS) for the Detection of Solvated Electrons at a Plasma-liquid Interface
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Theoretical study on ionization process in aqueous solution.

Kenji Iida1, Hirofumi Sato

  • 1Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan.

The Journal of Chemical Physics
|April 17, 2012
PubMed
Summary
This summary is machine-generated.

Ionization potential in solution differs from gas phase. This study uses a hybrid quantum mechanics/statistical mechanics method to analyze solvation effects on molecular ionization energies and spectral widths in water.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Quantum Chemistry

Background:

  • Ionization potential is crucial for understanding molecular electronic structure.
  • Solvation significantly alters ionization energies compared to the gas phase.

Purpose of the Study:

  • To investigate vertical and adiabatic ionization in aqueous solution.
  • To elucidate the role of solvation effects on ionization processes at a molecular level.

Main Methods:

  • Employed a hybrid quantum chemistry and statistical mechanics approach.
  • Utilized the reference interaction site model-SCF-spacial electron density distribution method.
  • Analyzed solvent distribution functions around solute molecules.

Main Results:

  • Elucidated the molecular-level influence of solvation on ionization.
  • Proposed a method to evaluate spectral width from solvent distribution functions.
  • Validated the proposed method against experimental data.

Conclusions:

  • Solvation effects play a critical role in molecular ionization in solution.
  • The developed hybrid method provides insights into solvation dynamics.
  • The proposed spectral width expression offers a predictive tool for experimental comparison.