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Related Concept Videos

Solution Formation02:16

Solution Formation

37.0K
There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
This selective...
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General Properties of Solutions02:12

General Properties of Solutions

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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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Osmosis and Osmotic Pressure of Solutions02:40

Osmosis and Osmotic Pressure of Solutions

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A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
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Ideal Solutions02:24

Ideal Solutions

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According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the...
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Enthalpy of Solution02:39

Enthalpy of Solution

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There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
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Standard Solutions01:14

Standard Solutions

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Standard solutions refer to solutions with a precisely known concentration or composition. A primary standard is a highly pure, high molar mass, stable substance that is entirely soluble in water, the most commonly used solvent in analytical chemistry. The primary standard solution can be used to standardize secondary standards, which are substances with known concentrations but are less pure and stable. Standard solutions are essential for achieving accurate and reliable results in analytical...
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Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
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A mechanism for reversible mesoscopic aggregation in liquid solutions.

Ho Yin Chan1, Vassiliy Lubchenko2,3

  • 1Department of Chemistry, University of Houston, Houston, TX, 77204-5003, USA.

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Scientists discovered a new mechanism explaining how solute-rich liquid droplets form in solutions, even outside stable conditions. This process involves molecules forming long-lived complexes, leading to droplet growth and eventual instability.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biophysics

Background:

  • Solutions often display unexpected liquid inclusions of solute-rich phases.
  • The mesoscopic size of these inclusions challenges current theories of heterophase fluctuations.

Purpose of the Study:

  • To elucidate a microscopic mechanism for the nucleation of metastable solute-rich liquid phases in solutions.
  • To explain the formation and evolution of mesoscopic inclusions outside thermodynamic stability.

Main Methods:

  • Theoretical modeling of nucleation and growth processes.
  • Analysis of molecular complex formation and its impact on phase stability.
  • Investigation of droplet dynamics, including mechanical instability and pressure changes.

Main Results:

  • A non-classical nucleation mechanism is proposed, dependent on the formation of long-lived solute complexes.
  • Nucleated droplets grow until mechanical instability arises due to reduced internal pressure.
  • The ensemble of droplets reaches a steady state, with initial evolution resembling Ostwald ripening.

Conclusions:

  • The study provides a microscopic explanation for the formation of metastable liquid inclusions in solutions.
  • Molecular complexation is identified as a key factor enabling nucleation outside stable phase regions.
  • Droplet growth and instability dynamics are linked to the metastability of the solute-rich phase.