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Related Concept Videos

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...
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides and...
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 EDTA Titration Curves01:20

Complexometric EDTA Titration Curves

EDTA titration curves determine the free metal ion concentration. The titration curve represents the change in concentration of free metal ions (p function) as a function of the volume of EDTA added. This curve consists of three regions: before, at, and after equivalence points. Excess free metal ions are present before the equivalence point. Equal concentrations of metal ions and EDTA are present at the equivalence point. After the equivalence point, excess EDTA exists. This means slight...
EDTA: Indirect and Alkalimetric Titration01:23

EDTA: Indirect and Alkalimetric Titration

Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...

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Related Experiment Video

Updated: Jun 28, 2026

TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples
09:51

TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples

Published on: September 19, 2025

Indirect complexometric determination of chromate.

A de Sousa1

  • 1Research Laboratories Alpha Materials Technology P.O. Box 816 Pottstown, Pa. 19464 U.S.A.

Talanta
|October 1, 1973
PubMed
Summary
This summary is machine-generated.

This study presents a method for determining chromate. The indirect determination involves precipitation, dissolution, and titration to quantify nickel liberated from silver chromate.

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Last Updated: Jun 28, 2026

TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples
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Area of Science:

  • Analytical Chemistry
  • Inorganic Chemistry

Background:

  • Chromate is an important environmental and industrial ion.
  • Accurate quantification of chromate is crucial for various applications.

Purpose of the Study:

  • To develop and validate an indirect analytical method for chromate determination.
  • To establish a reliable titration procedure for quantifying chromate levels.

Main Methods:

  • Indirect determination of chromate via precipitation as silver chromate.
  • Dissolution of the silver chromate precipitate using potassium tetracyanonickelate.
  • Titration of liberated nickel ions with ethylenediaminetetraacetic acid (EDTA) using Murexide indicator.

Main Results:

  • The method allows for the indirect quantification of chromate ions.
  • The titration provides a measurable endpoint for nickel determination.
  • The procedure is effective for determining chromate concentrations.

Conclusions:

  • The described indirect method provides a viable approach for chromate analysis.
  • This titration technique offers a practical solution for quantifying chromate in samples.
  • The use of Murexide as an indicator ensures accurate endpoint detection.