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Related Concept Videos

Solid–Solid Solutions01:24

Solid–Solid Solutions

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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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EDTA: Auxiliary Complexing Reagents01:26

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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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Solution Composition During Acid/Base Titrations01:17

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The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Composition of Polyprotic Acid Solutions as a Function of pH01:19

Composition of Polyprotic Acid Solutions as a Function of pH

1.1K
Polyprotic acids of the type H2M constitute two ionizable protons. As a result, on titration with a base, they exhibit two equivalence points in the titration curve. During titration, the species H2M, HM−, and M2− will be present in the solution at different points. The fractions of H2M, HM−, and M2− present at the various instances of the titration are denoted by α0, α1, and α2, respectively.
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Selecting Resolving Agents with Respect to Their Eutectic Compositions.

Zsolt Szeleczky1, Sándor Semsey1, Péter Bagi1

  • 1Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary.

Chirality
|January 23, 2016
PubMed
Summary
This summary is machine-generated.

Selecting the right resolving agent is key for racemic compound resolution. Agents with high eutectic composition consistently yield high enantiomeric excess, proving crucial for efficient separation.

Keywords:
classical resolutiondiastereomeric saltenantiomeric mixtureeutectic compositionresolving agent

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Area of Science:

  • Chemical Engineering
  • Organic Chemistry

Background:

  • Racemic compounds require chiral resolution for applications.
  • Identifying effective resolving agents is a critical challenge in chiral separation.

Purpose of the Study:

  • To investigate the impact of resolving agent eutectic composition on racemic resolution efficiency.
  • To determine if high eutectic composition is a predictor of successful chiral resolution.

Main Methods:

  • Screening of 18 different resolving agents.
  • Evaluation of resolutions performed with agents exhibiting high eutectic composition.
  • Quantification of enantiomeric excess achieved in each resolution.

Main Results:

  • High enantiomeric excess values were achieved across all 18 tested resolutions.
  • A strong correlation between high eutectic composition of resolving agents and successful resolution was observed.
  • The method demonstrated broad applicability for various racemic compounds.

Conclusions:

  • The eutectic composition of a resolving agent is a critical parameter for efficient chiral resolution.
  • Prioritizing resolving agents with high eutectic composition can significantly improve the success rate of developing resolution procedures.
  • This finding offers a valuable guideline for selecting optimal resolving agents in enantioselective separations.