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Solution Concentration and Dilution02:59

Solution Concentration and Dilution

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The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
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Expressing Solution Concentration02:48

Expressing Solution Concentration

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A solute is a component of a solution that is typically present at a much lower concentration than the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
Concentrations may be quantitatively assessed using a wide variety of measurement units, each convenient for particular applications. Molarity (M) is a useful concentration unit for many applications in chemistry.
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Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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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...
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Ionic Radii03:10

Ionic Radii

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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Solvent and concentration effects on highly defined, colloid-like ionic clusters in solution.

Jana Eisermann1, Lukas Prager, Dariush Hinderberger

  • 1Institute of Chemistry, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle, Saale, Germany. dariush.hinderberger@chemie.uni-halle.de.

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Summary

Researchers explored ionic self-assembly, creating ionoids from molecular boxes and salts. Optimal solvent and concentration are key for stable ionoid formation, with deviations leading to structural changes.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Colloid Science

Background:

  • Ionic self-assembly offers pathways to create complex nanostructures.
  • Macrocyclic hosts can template the formation of ionic clusters.

Purpose of the Study:

  • To characterize the formation and stability of ionoids, which are colloid-like ionic clusters.
  • To investigate the influence of solvent composition and concentration on ionoid properties.

Main Methods:

  • Dynamic Light Scattering (DLS) for size and shape analysis.
  • Continuous-Wave Electron Paramagnetic Resonance (CW EPR) spectroscopy for durability assessment.

Main Results:

  • Ionoid formation is sensitive to solvent mixtures, with deviations from DMSO:glycerol:water (50:43:7 v/v/v) causing evolution into separate entities.
  • A critical ionoid concentration (approx. 0.1 mM:0.3 mM) was identified, below which ionoids become unstable.
  • Soft, durable, and long-lived colloid-like ionic clusters (ionoids) can be formed within specific solvent and concentration ranges.

Conclusions:

  • Defined solvent and concentration parameters are crucial for reproducible ionoid formation.
  • The study establishes conditions for creating stable, self-assembled ionic clusters with potential applications.