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Related Concept Videos

Titrimetric Methods: Types and Commonly Used Strategies01:08

Titrimetric Methods: Types and Commonly Used Strategies

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In chemistry, titrimetric methods are broadly classified into three types: volumetric, gravimetric, and coulometric. Volumetric titrations involve measuring the volume of a titrant of known concentration that is required to react completely with an analyte. In gravimetric titrations, the standard solution reacts with the analyte to form an insoluble precipitate, which is filtered, dried, and weighed. In coulometric titrations, current is applied to an electrochemical reaction until the reaction...
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Controlled-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

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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.
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Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

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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...
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Classification of Titrimetric Analysis Based on Reaction Types01:01

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Titrimetric analysis in solution chemistry involves measuring the volume of solutions and is often called volumetric analysis. The standard solution of known concentration in the burette is called the titrant, whereas the solution of unknown concentration in the flask is called the analyte, or titrand. Titrimetric analyses can be classified into four types based on the reactions between the titrant and analyte.
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EDTA: Indirect and Alkalimetric Titration01:23

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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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Precipitation Titration: Overview01:26

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Precipitation titration involves the reaction of a titrant and an analyte to generate an insoluble precipitate. While precipitation titration uses various precipitating agents, silver nitrate is the most common precipitating reagent; titrations involving Ag+ are called argentometric titrations. Usually, the endpoint in a precipitation titration can be detected by visual indicators.
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Real-time Monitoring of Reactions Performed Using Continuous-flow Processing: The Preparation of 3-Acetylcoumarin as an Example
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Tracer-monitored flow titrations.

Milton K Sasaki1, Diogo L Rocha1, Fábio R P Rocha1

  • 1Center for Nuclear Energy in Agriculture, University of Sao Paulo, Brazil.

Analytica Chimica Acta
|December 26, 2015
PubMed
Summary
This summary is machine-generated.

This study demonstrates tracer-monitored titrations in a flow system, eliminating the need for calibration curves. This innovative method accurately measures acidity in vinegar using a dye tracer and spectrophotometry.

Keywords:
AcidityFlow analysisSpectrophotometryTracer-monitored titrationVinegars

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Area of Science:

  • Analytical Chemistry
  • Spectrophotometry
  • Flow Injection Analysis

Background:

  • Traditional titrations often require manual measurements and calibration curves.
  • Flow systems offer potential for automation and improved efficiency in chemical analysis.
  • Accurate determination of sample and titrant volumes is crucial for precise titration results.

Purpose of the Study:

  • To demonstrate the feasibility of tracer-monitored titrations in a flow system.
  • To develop a method that adheres to the IUPAC definition of titration by eliminating calibration curves.
  • To apply the method for the accurate determination of acidity in vinegar samples.

Main Methods:

  • Utilized a dye tracer to estimate volumetric fractions of sample and titrant in a flow system.
  • Employed spectrophotometric flow titrations with variations in flow rates (triangle programmed technique) and concentration gradients (flow injection system).
  • Simultaneously monitored a titration indicator and a dye tracer, with mechanical stirring to minimize diffusional effects.

Main Results:

  • The tracer-monitored titration method successfully estimated volumetric fractions without traditional measurements.
  • The approach was validated for acidity determination in vinegar, yielding reliable results comparable to a reference method.
  • Investigated the effects of sample volume, concentrations, and flow rates to optimize accuracy and precision.

Conclusions:

  • Tracer-monitored titrations in flow systems are feasible and offer a calibration-curve-free alternative.
  • The method provides accurate and precise results for acidity evaluation, aligning with IUPAC standards.
  • This technique enhances flow-based titrations by simplifying the process and ensuring true titration compliance.