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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...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
Complexometric Titration: Overview00:39

Complexometric Titration: Overview

Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free indicator. The...
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...
Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
Indicators02:39

Indicators

Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are called...

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Related Experiment Video

Updated: Jun 28, 2026

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
05:35

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Published on: January 17, 2020

Phenanthraquinone monothiosemicarbazone as indicator for chelatometric determinations.

A K Singh1, K C Trikha, R P Singh

  • 1Department of Chemistry, University of Delhi, Delhi 110007, India St. Stephen's College, Delhi 110007, India.

Talanta
|June 1, 1975
PubMed
Summary

Phenanthraquinone monothiosemicarbazone effectively determines copper, zinc, cadmium, mercury, and nickel using chelation. This new analytical method is successfully applied to diverse alloy samples.

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Last Updated: Jun 28, 2026

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Area of Science:

  • Analytical Chemistry
  • Inorganic Chemistry

Background:

  • Chelatometric titrations are crucial for metal ion quantification.
  • Developing new reagents enhances analytical accuracy and scope.

Purpose of the Study:

  • To evaluate phenanthraquinone monothiosemicarbazone as a chelating agent.
  • To establish its utility in the determination of specific divalent metal ions.

Main Methods:

  • Chelatometric determination using phenanthraquinone monothiosemicarbazone as an indicator.
  • Application of the method to the analysis of various metal alloys.

Main Results:

  • Phenanthraquinone monothiosemicarbazone demonstrated satisfactory performance for determining copper(II), zinc(II), cadmium(II), mercury(II), and nickel(II).
  • The method proved effective for analyzing metal content in different alloy compositions.

Conclusions:

  • Phenanthraquinone monothiosemicarbazone is a reliable reagent for the chelatometric analysis of target metal ions.
  • The developed method offers a practical approach for alloy analysis in industrial and research settings.