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Related Concept Videos

Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

1000
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...
1000
Ionic Crystal Structures02:42

Ionic Crystal Structures

15.8K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
15.8K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

555
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
555
Solubility Equilibria03:07

Solubility Equilibria

54.6K
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...
54.6K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

753
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
753
Formation of Complex Ions03:45

Formation of Complex Ions

24.5K
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...
24.5K

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Related Experiment Video

Updated: Oct 21, 2025

Microbiologically Induced Calcite Precipitation Mediated by Sporosarcina pasteurii
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Microbiologically Induced Calcite Precipitation Mediated by Sporosarcina pasteurii

Published on: April 16, 2016

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Structure and Surface Complexation at the Calcite(104)-Water Interface.

Frank Heberling1, Tin Klačić2, Paolo Raiteri3

  • 1Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany.

Environmental Science & Technology
|September 3, 2021
PubMed
Summary
This summary is machine-generated.

Calcite

Keywords:
calcitecrystal truncation rodsmineral−water interfacemolecular dynamics simulationsingle-crystal electrodesurface complexation modelsurface−structure/−potential/−chargezeta potential

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Calcium Carbonate Formation in the Presence of Biopolymeric Additives
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Area of Science:

  • Geochemistry
  • Environmental Science
  • Surface Chemistry

Background:

  • Calcite (calcium carbonate) is crucial for environmental pH control.
  • Surface phenomena at the calcite-water interface impact contaminant mobility, oil recovery, and nuclear waste disposal.
  • Understanding calcite's surface structure is vital for environmental and industrial applications.

Purpose of the Study:

  • To investigate the calcite(104)-water interface structure using crystal truncation rod data.
  • To develop and validate an electrostatic surface complexation model for calcite.
  • To provide a PhreeqC-compatible model for environmental applications.

Main Methods:

  • Extensive crystal truncation rod (CTR) data collection.
  • Development of a three-plane electrostatic surface complexation model.
  • Constraining the model with inner surface potential and zeta potential data.
  • Comparison with molecular dynamics simulations.

Main Results:

  • Detailed structural characterization of the calcite(104)-water interface.
  • Resolved ambiguities in the coordination of surface calcium ions.
  • Model parameters (protonation constants, ion-binding, capacitances) found to be chemically plausible.
  • Validated model parameters against experimental and simulation data.

Conclusions:

  • The study provides a refined structural understanding of the calcite-water interface.
  • The developed electrostatic model accurately describes ion adsorption and surface charging.
  • The presented PhreeqC model facilitates practical applications in environmental studies and geochemistry.