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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

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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...
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Colloidal precipitates01:09

Colloidal precipitates

4.5K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

1.7K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
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Electrodeposition01:08

Electrodeposition

1.2K
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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Related Experiment Video

Updated: Dec 24, 2025

Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
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Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution

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Copper(I) Promotes Silver Sulfide Dissolution and Increases Silver Phytoavailability.

Yingnan Huang1,2, Cun Liu1,2, Peixin Cui1,2

  • 1Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P. R. China.

Environmental Science & Technology
|April 11, 2020
PubMed
Summary
This summary is machine-generated.

Copper(I) drives the dissolution of silver sulfide (Ag2S) in soil, increasing silver mobility. This process is crucial for understanding metal sulfide behavior in the environment and potentially in living organisms.

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium
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Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium
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Area of Science:

  • Environmental Science
  • Geochemistry
  • Biogeochemistry

Background:

  • Colloidal metal sulfides like acanthite (Ag2S) are environmentally persistent.
  • They can enhance the mobility of trace metal contaminants in soil.
  • Natural in situ dissolution processes of colloidal metal sulfides are poorly understood.

Purpose of the Study:

  • To investigate the dissolution of colloidal Ag2S in topsoil.
  • To examine silver (Ag) phytoavailability to wheat in Ag2S-Cu(II)-thiosulfate systems.
  • To elucidate the mechanisms driving Ag2S dissolution and silver mobility.

Main Methods:

  • Experimental study of Ag2S dissolution in topsoil amended with Cu(II) and thiosulfate.
  • Analysis of silver release and phytoavailability to wheat.
  • Spectroscopic techniques (EPR, XPS, Cu K-edge XAS) and Density Functional Theory (DFT) calculations.

Main Results:

  • Cu(II) and thiosulfate significantly increased Ag release from Ag2S (up to 83%) in the dark.
  • Cu(I) was identified as the primary agent promoting Ag2S dissolution.
  • DFT calculations confirmed Cu(I) energetically favors substitution for surface Ag on Ag2S.
  • Excess Cu(II) led to the formation of Cu(I)-Ag-S precipitates.
  • Cu(I) acts as both a dissolution promoter and a precipitating agent for Ag2S.

Conclusions:

  • Cu(I) plays a key role in the biogeochemical cycling of colloidal Ag2S in soil environments.
  • These findings reveal novel mechanisms governing metal sulfide fate and mobility.
  • Understanding these processes is important for environmental risk assessment and potential in vivo implications.