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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.4K
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...
2.4K
Complexometric Titration: Overview00:39

Complexometric Titration: Overview

12.4K
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...
12.4K
Complexometric EDTA Titration Curves01:20

Complexometric EDTA Titration Curves

2.2K
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...
2.2K
Acid-Base Titration Curves02:23

Acid-Base Titration Curves

141.8K
A titration curve is a plot of some solution property versus the amount of added titrant. For acid-base titrations, solution pH is a useful property to monitor because it varies predictably with the solution composition and, therefore, may be used to monitor the titration’s progress and detect its endpoint. Acid-base titration can be performed with a strong acid and a strong base, a strong acid and a weak base, or a strong base and a weak acid.
For a titration carried out for 25.00 mL of...
141.8K
Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

49.4K
Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
49.4K
Titration Calculations: Strong Acid - Strong Base02:28

Titration Calculations: Strong Acid - Strong Base

34.1K
Calculating pH for Titration Solutions: Strong Acid/Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
34.1K

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Fabricating Cotton Analytical Devices
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Complexometric and argentometric titrations using thread-based analytical devices.

Purim Jarujamrus1, Nutthaporn Malahom1, Sodsai Puchum1

  • 1Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand; Nanomaterials Science, Sensors & Catalysis for Problem-Based Projects, Faculty of Science, Ubon Ratchathani University, Warin Chamrap, Ubon Ratchathani 34190, Thailand.

Talanta
|March 24, 2018
PubMed
Summary

This study introduces a novel microfluidic thread-based analytical device (µTAD) for rapid chemical analysis. The µTAD uses color changes on a treated cotton thread to quantify analyte concentrations in aqueous solutions, offering a simple and effective method.

Keywords:
Argentometric titrationChlorideComplexometric titrationMagnesium (Mg(II))Microfluidic thread-based analytical device (µTAD)

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Traditional analytical methods can be time-consuming and require specialized equipment.
  • There is a need for rapid, portable, and cost-effective analytical devices for on-site measurements.
  • Microfluidic devices offer miniaturization and enhanced reaction control for analytical applications.

Purpose of the Study:

  • To develop and validate a novel microfluidic thread-based analytical device (µTAD) for quantitative chemical analysis.
  • To demonstrate the application of µTADs for complexometric and argentometric titrations.
  • To assess the performance of µTADs in analyzing real-world samples.

Main Methods:

  • Fabrication of µTADs from indicator-treated cotton threads immobilized on supporting platforms.
  • Development of complexometric titration protocols using Eriochrome Black T (EBT) and ethylenediaminetetraacetic acid (EDTA) for Mg(II) determination.
  • Development of argentometric titration protocols using silver nitrate (AgNO3) and potassium dichromate (K2CrO4) for chloride ion determination.
  • Visual analysis of color change zone lengths correlated with analyte concentrations.

Main Results:

  • µTADs enabled rapid determination of Mg(II) in water and rubber latex samples within a 25-1000 mg/L range.
  • µTADs facilitated argentometric titration of chloride in water and food seasoning samples within a 75-600 mg/L range.
  • The developed µTADs demonstrated good selectivity and accuracy, with results comparable to classical titration methods.

Conclusions:

  • The microfluidic thread-based analytical device (µTAD) provides a simple, rapid, and cost-effective platform for quantitative chemical analysis.
  • µTADs are versatile and can be adapted for various titration methods, including complexometric and argentometric analyses.
  • The developed µTADs show promise for field applications and point-of-use testing due to their ease of use and visual readout.