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Related Concept Videos

Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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...
Qualitative Analysis03:46

Qualitative Analysis

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...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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 formed in...
Electrodeposition01:08

Electrodeposition

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...
Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...

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Related Experiment Video

Updated: Jun 28, 2026

Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
07:00

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

Published on: March 20, 2019

A new sensitive reagent for identifying and determining Cu(2+).

D Ma1, D Xia, F Cui

  • 1Department of Chemistry, Henan Normal University, Xin Xiang, Henan, 453002, People's Republic of China.

Talanta
|October 31, 2008
PubMed
Summary

A new compound, N-undecyl-N'-(sodium p-aminobenzenesulfonate)-thiourea (UPT), was synthesized for copper analysis. This reagent offers a sensitive and selective method for detecting copper(II) in aqueous solutions.

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Last Updated: Jun 28, 2026

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

Published on: March 20, 2019

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Quantifying the Binding Interactions Between Cu(II) and Peptide Residues in the Presence and Absence of Chromophores
11:38

Quantifying the Binding Interactions Between Cu(II) and Peptide Residues in the Presence and Absence of Chromophores

Published on: April 5, 2022

Area of Science:

  • Analytical Chemistry
  • Organic Synthesis
  • Environmental Science

Background:

  • Copper(II) ions are essential micronutrients but toxic at higher concentrations.
  • Accurate detection of copper is crucial for environmental monitoring and biological studies.
  • Existing methods for copper determination often lack sufficient sensitivity or selectivity.

Purpose of the Study:

  • To synthesize a novel long-chain saturated fatty hydrocarbon substituting group compound.
  • To evaluate the analytical performance of the synthesized compound for copper ion detection.
  • To establish a new, sensitive, and selective method for determining copper in aqueous solutions.

Main Methods:

  • Synthesis of N-undecyl-N'-(sodium p-aminobenzenesulfonate)-thiourea (UPT).
  • Analytical studies on the performance of UPT for copper(II) identification and quantification.
  • Spectrophotometric determination of copper using UPT with a molar absorptivity of 2.39x10(5) l mol(-1)cm(-1) at 300.4 nm.

Main Results:

  • Successful synthesis of the UPT reagent.
  • UPT demonstrated high sensitivity and selectivity for Cu(2+) detection (PD 6.3).
  • The method achieved a molar absorptivity of 2.39x10(5) l mol(-1)cm(-1) for microamount copper determination.

Conclusions:

  • The synthesized UPT compound is a promising reagent for copper analysis.
  • UPT offers superior sensitivity and selectivity compared to existing common methods.
  • The developed method is simple, convenient, and provides satisfactory results for copper determination in aqueous samples.