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Related Concept Videos

Redox Titration: Overview01:21

Redox Titration: Overview

Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
Redox Titration: Iodimetry and Iodometry01:23

Redox Titration: Iodimetry and Iodometry

Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...
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: 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...
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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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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Redox indicators in titrations with dichloramine-B.

H S Gowda1, R Shakunthala, U Subrahmanya

  • 1Department of Post-graduate Studies and Research in Chemistry, University of Mysore, Manasa Gangotri, Mysore, India.

Talanta
|December 1, 1980
PubMed
Summary
This summary is machine-generated.

Several indicators, including naphthidine and o-dianisidine, effectively signal the endpoint in titrations using dichloramine-B. Arsenic(III) and iron(II) are recommended for standardizing dichloramine-B solutions.

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Area of Science:

  • Analytical Chemistry
  • Redox Titrimetry

Background:

  • Dichloramine-B is a versatile oxidizing agent used in various titrations.
  • Accurate endpoint detection is crucial for reliable quantitative analysis.

Purpose of the Study:

  • To evaluate the suitability of several organic compounds as indicators in dichloramine-B titrations.
  • To propose methods for standardizing dichloramine-B solutions and determining specific analytes.

Main Methods:

  • Titrimetric analysis using dichloramine-B as the titrant.
  • Visual endpoint detection with proposed indicators.
  • Potentiometric determination for specific analytes.

Main Results:

  • Naphthidine, dimethylnaphthidine, dimethylnaphthidinedisulphonic acid, o-dianisidine, Quinoline Yellow, diphenylbenzidine, and Amaranth provide sharp color changes at the equivalence point.
  • Arsenic(III) and iron(II) are suitable for standardizing dichloramine-B.
  • A potentiometric method was developed for determining arsenic(III) and semicarbazide hydrochloride.

Conclusions:

  • The proposed indicators are effective for dichloramine-B titrations.
  • Arsenic(III) and iron(II) can be used for reliable standardization of dichloramine-B solutions.
  • Potentiometric methods offer an alternative for specific analyte determinations.