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Related Concept Videos

Titrimetric Methods: Types and Commonly Used Strategies01:08

Titrimetric Methods: Types and Commonly Used Strategies

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

Classification of Titrimetric Analysis Based on Reaction Types

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.
Titrations between an acid and a base lead to neutralization reactions that form...
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...
Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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...
Precipitation Titration: Overview01:26

Precipitation Titration: Overview

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.
A precipitation titration curve demonstrates the change in concentration of the titrant or analyte upon adding the...

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Isothermal Titration Calorimetry for Measuring Macromolecule-Ligand Affinity
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Published on: September 7, 2011

A new sensor for thermometric titrations.

Fadhil M Najib1, Sardir Zewar, Ahmad M Abdulla

  • 1Chemistry Department, Collage of Science, Sulaimani University, Kurdistan Region, Iraq. fadhilmn@yahoo.com

Talanta
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

A novel transistor-based thermometric sensor accurately monitors titrations, enabling precise determination of acid concentrations and pK values. This sensor also facilitates the kinetic catalytic determination of iron(III) in various samples.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Accurate endpoint detection is crucial for quantitative chemical analysis.
  • Traditional thermometric sensors may have limitations in sensitivity and applicability.
  • Development of novel sensors can enhance analytical methodologies.

Purpose of the Study:

  • To introduce and evaluate a transistor (OC71) as a thermometric sensor for titrations.
  • To assess the sensor's performance in determining acid concentrations and pK values.
  • To explore the sensor's utility in kinetic catalytic determinations.

Main Methods:

  • Utilized a transistor (OC71) as a thermometric sensor in normal and differential titration modes.
  • Determined the pK values of weak acids (acetic, phosphoric, boric) using the sensor with a pH glass electrode.
  • Applied the sensor for kinetic catalytic determination of iron(III) in water, milk, and pharmaceutical samples.

Main Results:

  • The transistor sensor successfully followed thermometric titrations, providing clear endpoints.
  • Achieved high accuracy and precision for titrating hydrochloric acid (HCl) and boric acid (H3BO3) down to low micromolar levels.
  • Accurately determined pK values for well-established and uncertain weak acids, and demonstrated feasibility for iron(III) determination.

Conclusions:

  • The transistor (OC71) serves as an effective thermometric sensor for various analytical applications.
  • The sensor offers high sensitivity and precision for trace analysis and pK determination.
  • This novel sensor expands the capabilities of thermometric titration and kinetic analysis.