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Related Concept Videos

Nonideal Two-Component Liquid Solutions01:29

Nonideal Two-Component Liquid Solutions

Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...
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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Published on: December 4, 2017

Communication: Long-range angular correlations in liquid water.

Yu Liu1, Jianzhong Wu

  • 1Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, USA.

The Journal of Chemical Physics
|August 2, 2013
PubMed
Summary
This summary is machine-generated.

Liquid water

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Area of Science:

  • Physical Chemistry
  • Liquid State Physics
  • Computational Chemistry

Background:

  • Intermolecular correlations in liquid water are typically considered short-ranged based on atomic pair distribution functions (PDFs).
  • Atomic PDFs offer an incomplete view of molecular correlations, neglecting molecular orientations.

Purpose of the Study:

  • To investigate both atomic PDFs and angular correlation functions (ACF) in liquid water.
  • To explore the full intermolecular correlation in liquid water, including orientational effects.

Main Methods:

  • Utilized classical density functional theory (DFT) for simulations.
  • Calculated atomic PDFs and ACF for liquid water.

Main Results:

  • The angular correlation function (ACF) displays long-range oscillatory decay.
  • This long-range correlation extends over tens of molecular diameters, unlike short-ranged PDFs.
  • Theoretical predictions align well with molecular simulations and experimental data.

Conclusions:

  • Liquid water exhibits long-range orientational correlations not captured by traditional PDFs.
  • The ACF provides a more comprehensive description of intermolecular structure in liquid water.
  • Findings support recent experimental observations and enhance understanding of water's unique properties.