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Precipitation of Ions

Precipitation of Ions

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Ions and Ionic Charges

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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called ions.

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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 to...

Ions, Molecules, and Compounds

Ions, Molecules, and Compounds

Ions - When an atom participates in a chemical reaction that results in the donation or acceptance of one or more electrons, the atom becomes positively or negatively charged. This frequently happens for most atoms to have a full valence shell. This can happen either by gaining electrons to fill a shell that is more than half-full or by giving away electrons to empty a shell that is less than half-full, thereby leaving the next smaller electron shell as the new, full valence shell. An atom with...

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:

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Related Experiment Video

Updated: Jul 11, 2026

Real-time Iontophoresis with Tetramethylammonium to Quantify Volume Fraction and Tortuosity of Brain Extracellular Space

Real-time Iontophoresis with Tetramethylammonium to Quantify Volume Fraction and Tortuosity of Brain Extracellular Space

Published on: July 24, 2017

Io's Sodium Cloud.

B A Goldberg, G W Garneau, S K Lavoie

Science (New York, N.Y.)

|November 2, 1984

Summary

This summary is machine-generated.

Ground-based observations reveal new details about Jupiter

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Last Updated: Jul 11, 2026

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Area of Science:

Planetary Science
Astronomy
Space Physics

Background:

Io's neutral sodium cloud is a key feature of Jupiter's magnetosphere.
Previous observations lacked detailed spatial and temporal resolution of the cloud's source region.

Purpose of the Study:

To obtain the first two-dimensional images of Io's neutral sodium cloud source region.
To comprehensively study the spatial and temporal variations of the cloud.

Main Methods:

Ground-based observation using advanced imaging techniques.
High-time-resolution, calibrated image sequences were acquired.

Main Results:

First 2D images of the sodium cloud source region were obtained.
Observed asymmetries suggest non-isotropic sodium ejection from Io.
The cloud exhibits orbital-dependent behavior, spatial morphologies, and temporal changes.
Geometric stability of the sodium source was indicated.

Conclusions:

New evidence supports non-isotropic sodium ejection from Io.
Io's sodium cloud displays complex, dynamic behavior linked to its orbit.
The cloud's temporal changes are now isolatable, paving the way for its use as a probe.