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Related Concept Videos

Solubility Equilibria03:07

Solubility Equilibria

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Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
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Solution Equilibrium and Saturation01:59

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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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Dynamic Equilibrium02:20

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Solubility Equilibria: Overview01:09

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When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
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Chemical Equilibria: Systematic Approach to Equilibrium Calculations01:21

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Equilibrium calculations for systems involving multiple equilibria are often complex. For example, to calculate the solubility of a sparingly soluble salt in an aqueous solution in the presence of a common ion, one must consider all the equilibria in this solution. Calculations for these systems can be complicated and tedious, so a systematic approach with a series of steps is often helpful. The process is detailed below.
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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Related Experiment Video

Updated: Apr 15, 2026

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
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Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability

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Sedimentation equilibrium studies.

Ian A Taylor1, Katrin Rittinger, John F Eccleston

  • 1Division of Molecular Structure, MRC National Institute for Medical Research, The Ridgeway Mill Hill, London, NW7 1AA, UK, itaylor@nimr.mrc.ac.uk.

Methods in Molecular Biology (Clifton, N.J.)
|April 11, 2015
PubMed
Summary
This summary is machine-generated.

Understanding protein-protein interactions is key in biology. Sedimentation equilibrium accurately determines molecular weight and self-association, aiding the study of reversible protein interactions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Protein-protein interactions are vital for numerous biological processes.
  • Characterizing these interactions requires understanding the oligomerization state of proteins.
  • Reversible protein associations are fundamental to cellular function.

Purpose of the Study:

  • To highlight the importance of determining oligomerization states for quantitative analysis of protein interactions.
  • To present sedimentation equilibrium as a key method for characterizing macromolecular solutions.
  • To emphasize the utility of sedimentation equilibrium in studying self-associating systems.

Main Methods:

  • Sedimentation equilibrium is employed to measure the molecular weight of macromolecules in solution.
  • This method provides absolute and accurate molecular weight values.
  • The technique is independent of the macromolecule's shape.

Main Results:

  • Sedimentation equilibrium reliably determines the solution molecular weight of macromolecules.
  • It allows for the accurate assessment of oligomerization states.
  • Equilibrium constants for monomer-multimer self-associating systems can be determined.

Conclusions:

  • Sedimentation equilibrium is an ideal method for the quantitative characterization of protein-protein interactions.
  • Accurate determination of molecular weight and oligomerization state is crucial for understanding biological processes.
  • This technique facilitates the study of reversible self-association in biological macromolecules.