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Related Concept Videos

Potentiometric Titration: Overview01:31

Potentiometric Titration: Overview

Potentiometric titration is a quantitative analytical technique that determines the concentration of an analyte by measuring the potential difference between the two electrodes in the solution. The endpoint of a potentiometric titration is the point at which there is a significant change in the potential difference. It occurs when the stoichiometric reaction between the analyte and the titrant is complete. The endpoint is usually determined graphically by plotting the measured potential...
Controlled-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential ensures...
Potentiometry: Overview01:06

Potentiometry: Overview

Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as the...
Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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...

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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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A computer-controlled potentiometric/spectrophotometric titrator.

J D Stong1

  • 1Merck Sharp & Dohme Research Laboratories PO Box 2000 Rahway New Jersey 07065 USA.

The Journal of Automatic Chemistry
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

A new computer-controlled potentiometric titrator interfaced with a spectrophotometer offers precise chemical analysis. This system demonstrates reliable performance for determining titres and acid dissociation constants (pKa).

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Area of Science:

  • Analytical Chemistry
  • Instrumental Analysis

Background:

  • Potentiometric and spectrophotometric titrations are essential analytical techniques.
  • Integrating these methods can enhance analytical capabilities and efficiency.

Purpose of the Study:

  • To describe a laboratory computer-controlled potentiometric titrator interfaced with a diode array spectrophotometer.
  • To evaluate the system's performance and data handling capabilities.

Main Methods:

  • Utilized widely available commercial components for system construction.
  • Developed software for interconnection, data format, and system control.
  • Performed replicate potentiometric titrations of glycines and spectrophotometric titrations of bromophenol blue.

Main Results:

  • Potentiometric titrations of glycines yielded a relative standard deviation in titre of 1.035% and in pH of 0.745%.
  • Spectrophotometric titrations of bromophenol blue determined pKa = 3.898 ± 0.075 (1.9% rsd).

Conclusions:

  • The described system provides a reliable and accurate platform for combined potentiometric and spectrophotometric titrations.
  • The developed software facilitates effective data presentation and manipulation for analytical applications.