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Related Concept Videos

Qualitative Analysis03:46

Qualitative Analysis

27.4K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.3K
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...
1.3K
Alkali Metals03:06

Alkali Metals

25.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
25.3K
Solvents01:12

Solvents

71.9K
A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
71.9K
Ions as Acids and Bases02:54

Ions as Acids and Bases

27.2K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
27.2K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

3.7K
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...
3.7K

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Preparation of Binary and Ternary Deep Eutectic Systems
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Preparation of Binary and Ternary Deep Eutectic Systems

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Do group 1 metal salts form deep eutectic solvents?

A P Abbott1, C D'Agostino2, S J Davis1

  • 1Department of Chemistry, University of Leicester, Leicester LE1 7RH, UK. apa1@le.ac.uk.

Physical Chemistry Chemical Physics : PCCP
|October 7, 2016
PubMed
Summary
This summary is machine-generated.

This study investigated sodium salts with glycerol, finding they form deep eutectic solvent-like mixtures, not true eutectics. These mixtures showed increased viscosity, suggesting sodium ions structure glycerol, unlike previous findings with other salts.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Ionic Liquids

Background:

  • Metal salts like ZnCl2 form eutectic mixtures with complexing agents.
  • Research has not extensively explored alkali metal salts forming similar mixtures.

Purpose of the Study:

  • To investigate if alkali metal salts, specifically sodium salts, form eutectic mixtures with glycerol.
  • To characterize the physical properties and molecular dynamics of these glycerol-sodium salt mixtures.

Main Methods:

  • Preparation and characterization of sodium salt-glycerol mixtures.
  • Measurement of ionic conductivity and viscosity.
  • Nuclear Magnetic Resonance (NMR) spectroscopy (1H and 23Na diffusion and relaxation) to study molecular dynamics.

Main Results:

  • Limited sodium salts formed homogeneous liquids with glycerol, exhibiting properties of deep eutectic solvents but not true eutectics.
  • Most sodium salts increased the viscosity of glycerol, indicating a structure-making effect attributed to Na+ ion charge density.
  • NMR studies revealed complex dynamic behavior and highlighted the role of Na-containing species in structuring the liquids.

Conclusions:

  • Sodium salts with glycerol do not form classical eutectics but rather deep eutectic solvent-like systems.
  • The high charge density of Na+ ions influences glycerol's structure, increasing viscosity.
  • Molecular dynamics are complex, with Na+ ions playing a significant role in the liquid structure.