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Qualitative Analysis03:46

Qualitative Analysis

22.0K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
561
Ions as Acids and Bases02:54

Ions as Acids and Bases

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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:
23.6K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.4K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
1.4K
Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

756
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
756
Electrodeposition01:08

Electrodeposition

610
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Quaternary Ammonium Salts as Supporting Electrolytes in Cathodic Reductions: An Analysis of Their Electrochemical

Florian Mast1, Maximilian M Hielscher1, Eva Plut2

  • 1Department Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.

The Journal of Physical Chemistry. B
|June 11, 2025
PubMed
Summary
This summary is machine-generated.

This study explores the electrochemical stability of over 5000 quaternary ammonium cations. Ring-opening cations show greater stability and are promising as supporting electrolytes in electrochemical reductions.

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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Area of Science:

  • Electrochemistry
  • Computational Chemistry
  • Physical Chemistry

Background:

  • Quaternary ammonium ions are widely used in electrochemistry.
  • Understanding their electrochemical stability is crucial for optimizing applications.
  • Previous studies have focused mainly on tetraalkylammonium ions.

Purpose of the Study:

  • To investigate the thermodynamic and kinetic electrochemical stability of over 5000 quaternary ammonium cations.
  • To categorize cation behavior under one-electron reduction.
  • To identify novel supporting electrolytes for electrochemical reductions.

Main Methods:

  • Density functional theory (DFT) calculations with an implicit solvent model.
  • Calculation of redox potentials and inner-sphere reorganization energies.
  • Analysis of structural changes upon one-electron reduction.

Main Results:

  • Three categories of cation behavior under reduction were identified: fragmentation, ring-opening, and minor structural changes.
  • Ring-opening cations demonstrated higher electrochemical stability on average.
  • Linear correlations were observed between adiabatic electron affinities/ionization potentials and redox potentials, but not frontier orbital energies.
  • Inner-sphere reorganization energies were similar for oxidized and reduced states across all categories.

Conclusions:

  • Certain ring-opening quaternary ammonium cations are suitable as supporting electrolytes, complementing tetraalkylammonium ions.
  • DFT calculations accurately predict electrochemical behavior and stability.
  • Marcus theory in the harmonic approximation is applicable to electron transfer in these systems.