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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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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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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...
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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.0K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Isopotential Electron Titration: Hydrogen Adsorbate-Metal Charge Transfer.

Justin A Hopkins1,2, Benjamin J Page1,3, Shengguang Wang1,3,4

  • 1Center for Programmable Energy Catalysis, University of Minnesota, Department of Chemical Engineering & Materials Science, 421 Washington Ave. SE, Minneapolis, Minnesota 55455, United States.

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Summary

Researchers developed isopotential electron titration (IET) to directly measure charge transfer between adsorbates and catalytic surfaces. This method quantifies electron donation from adsorbed hydrogen to platinum, advancing surface science and catalysis characterization.

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Area of Science:

  • Surface Science
  • Catalysis
  • Electrochemistry

Background:

  • Charge transfer at the adsorbate-thermocatalytic surface interface is crucial for catalytic activity.
  • Direct, quantitative measurement of this charge transfer has been a significant challenge in surface science.

Purpose of the Study:

  • To introduce and validate a novel method, isopotential electron titration (IET), for directly quantifying charge transfer between adsorbates and catalytic surfaces.
  • To investigate the charge transfer dynamics between adsorbed hydrogen and a platinum (Pt) surface.

Main Methods:

  • Utilized a catalytic condenser setup with a Pt surface, a p-type silicon layer, and a hafnia dielectric film.
  • Achieved isopotential conditions between Pt and Si layers to titrate adsorbate-surface charge transfer via an external circuit.
  • Employed Bader charge analysis for theoretical validation of experimental results.

Main Results:

  • Demonstrated that adsorbed hydrogen atoms donate electrons to the Pt surface upon adsorption, with this transfer being reversible upon desorption.
  • Quantified the charge transferred to Pt by an adsorbed hydrogen atom as 0.19 ± 0.01% |e|/H across temperatures of 125-200 °C.
  • Experimental findings were corroborated by Bader charge analysis, indicating a net donation of 0.4% |e|/H.

Conclusions:

  • Isopotential electron titration (IET) provides a direct, quantitative, and electronic-based method for characterizing catalytic surfaces and adsorbed species.
  • This technique enables a deeper understanding of the electronic interactions governing catalytic reactions.
  • The study opens avenues for precise electronic characterization of catalytic materials and reaction mechanisms.