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Related Concept Videos

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
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The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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Ionic Strength: Effects on Chemical Equilibria01:19

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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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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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Structurally Related Scaling Behavior in Ionic Systems.

S Cheng1, M Musiał1, Z Wojnarowska1

  • 1Institute of Physics , University of Silesia in Katowice, Silesian Center for Education and Interdisciplinary Research , 75 Pułku Piechoty 1A , 41-500 Chorzów , Poland.

The Journal of Physical Chemistry. B
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Summary
This summary is machine-generated.

Ionic liquids exhibit density scaling, but polymeric ionic liquids deviate. This study reveals conductivity and entropy scaling behaviors in ionic liquids under varying temperature and pressure conditions.

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Area of Science:

  • Physical Chemistry
  • Materials Science

Background:

  • Density scaling is a theoretical framework applicable to simple liquids.
  • Ionic liquids (ILs) have shown limited adherence to density scaling in prior research.
  • Intermolecular associations, like hydrogen bonds, can influence scaling properties.

Purpose of the Study:

  • To investigate the density scaling behavior of a low molecular weight ionic liquid, [BMIm][BETI], and a polymeric ionic liquid, TPIL.
  • To determine the applicability of density scaling to the dc-conductivity and entropy of these ionic materials.
  • To explore the influence of temperature and pressure variations on density scaling in ionic liquids.

Main Methods:

  • Experimental measurement of dc-conductivity and entropy for [BMIm][BETI] and TPIL.
  • Analysis of density scaling properties across a range of temperatures and pressures.
  • Comparison of scaling behavior between the low molecular weight and polymeric ionic liquids.

Main Results:

  • The dc-conductivity of [BMIm][BETI] demonstrated accurate density scaling over a 17% density change.
  • TPIL showed a departure from density scaling even with minor temperature and pressure variations.
  • Entropy scaling was observed for both ionic samples, but only when the scaling exponent was permitted to vary with entropy magnitude.

Conclusions:

  • Density scaling is applicable to the dc-conductivity of certain ionic liquids, like [BMIm][BETI], under specific conditions.
  • Polymeric ionic liquids, such as TPIL, exhibit more complex behavior and deviate from simple density scaling.
  • The findings suggest that the structure and intermolecular interactions in ionic materials significantly impact their adherence to density scaling principles.