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Related Concept Videos

Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
Calculating the Equilibrium Constant02:46

Calculating the Equilibrium Constant

The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these concentrations are known, the calculation simply involves their substitution into the Kc expression.
For example, gaseous nitrogen dioxide forms dinitrogen tetroxide according to this equation:
Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an organic...
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Calculating Equilibrium Concentrations02:05

Calculating Equilibrium Concentrations

Being able to calculate equilibrium concentrations is essential to many areas of science and technology—for example, in the formulation and dosing of pharmaceutical products. After a drug is ingested or injected, it is typically involved in several chemical equilibria that affect its ultimate concentration in the body system of interest. Knowledge of the quantitative aspects of these equilibria is required to compute a dosage amount that will solicit the desired therapeutic effect.
A more...
Solubility Equilibria03:07

Solubility Equilibria

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.
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Related Experiment Video

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

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Diffusion coefficients and complex equilibria in solution-III Graphical evaluation of formation constants from

D R Crow1

  • 1Department of Physical Sciences, The Polytechnic, Wolverhampton, England.

Talanta
|September 1, 1983
PubMed
Summary
This summary is machine-generated.

This study introduces a new graphical method to estimate diffusion coefficients for metal-ligand complexes. The technique utilizes average diffusion coefficients derived from formation constants calculated using diffusion currents.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Coordination Chemistry

Background:

  • Metal-ligand systems involve complex equilibria that are challenging to analyze.
  • Determining individual diffusion coefficients of participating complexes is crucial for understanding these systems.
  • Existing methods for calculating formation constants from diffusion currents can be limited.

Purpose of the Study:

  • To develop and present a novel graphical method for estimating individual diffusion coefficients.
  • To apply this new method to various metal-ligand systems.
  • To demonstrate the utility of the method using systems with distinct characteristics.

Main Methods:

  • Calculation of provisional formation constants from observed diffusion currents.
  • Development of a graphical approach utilizing average diffusion coefficients.
  • Application and testing of the method on four selected metal-ligand systems.

Main Results:

  • The proposed graphical method allows for the estimation of individual diffusion coefficients.
  • The method is applicable to metal-ligand systems with complex equilibria.
  • Successful application to diverse systems validates the method's robustness.

Conclusions:

  • The new graphical method provides a valuable tool for characterizing metal-ligand complex diffusion.
  • This approach enhances the understanding of equilibria in metal-ligand systems.
  • The method offers a practical way to estimate diffusion coefficients when formation constants are known.