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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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Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.
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Osmosis is a process where solvent molecules move toward a solution through a semipermeable membrane. As the solution dilutes due to the entry of solvent, it expands. This expansion increases the hydrostatic pressure of the solution. When the hydrostatic pressure equals the osmotic pressure, osmosis stops.Osmotic pressure, denoted by Π, is the minimum pressure needed to prevent the solvent from passing into the solution by osmosis. The van 't Hoff equation calculates the osmotic pressure...
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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).
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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Osmosis and thermodynamics explained by solute blocking.

Peter Hugo Nelson1

  • 1Department of Physics, Benedictine University, Lisle, IL, USA. pete@circle4.com.

European Biophysics Journal : EBJ
|May 27, 2016
PubMed
Summary

A new solute-blocking model offers a kinetic explanation for osmosis, distinct from traditional models. It clarifies osmotic equilibrium and explains colligative properties based on solute mole fraction, not size.

Keywords:
AquaporinColligative propertiesControversyKineticsOsmosisThermodynamics

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Area of Science:

  • Thermodynamics
  • Physical Chemistry
  • Solution Theory

Background:

  • Traditional models explain osmosis via convective flow.
  • Ideal solution thermodynamics and colligative properties require a kinetic basis.
  • Existing models do not fully explain the kinetic underpinnings of these phenomena.

Purpose of the Study:

  • To present a solute-blocking model for osmosis and ideal solution thermodynamics.
  • To provide a kinetic explanation for osmotic equilibrium and colligative properties.
  • To validate a diffusive model of osmosis.

Main Methods:

  • Development of a kinetic solute-blocking model.
  • Analysis of water molecule energy distribution relative to pressure differences.
  • Application of the model to explain Raoult's law and entropy of mixing.

Main Results:

  • The solute-blocking model provides a kinetic explanation for osmosis, distinct from convective models.
  • Osmotic equilibrium is defined by the energy of water molecules overcoming pressure differences.
  • The model explains the dependence of colligative properties on solute mole fraction, not particle size.

Conclusions:

  • The solute-blocking model offers a novel kinetic framework for understanding osmosis and ideal solutions.
  • It provides a unified kinetic explanation for osmotic equilibrium, colligative properties, and thermodynamic concepts.
  • Experimental validation of the model's predictions is ongoing.