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Precipitation of Ions

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Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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Related Experiment Video

Updated: May 13, 2026

Iridium(III) Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II

Iridium(III) Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II

Published on: July 7, 2015

Iodide mumps.

Anthony Minh Tien Chau¹, Dan Suan

¹IBAC, St Vincent's Hospital, Sydney, NSW 2010 Australia.

Clinical Imaging

|March 8, 2013

Summary

Iodide sialadenitis is a rare adverse reaction to iodine contrast media. Non-contrast CT scans reveal this benign condition affecting the submandibular glands.

Area of Science:

Radiology
Pathology

Background:

Iodine-containing contrast media are widely used in medical imaging.
Adverse reactions to contrast media can occur, though some are rare.

Observation:

This study presents imaging findings of iodide sialadenitis.
The condition is a delayed, idiosyncratic reaction.
It specifically affects the submandibular glands.

Findings:

Non-contrast computed tomography (CT) images were used to visualize the reaction.
The imaging demonstrated a dramatic, yet benign, presentation.
The submandibular glands were the primary site of the observed changes.

Implications:

Radiologists should be aware of iodide sialadenitis as a potential diagnosis.

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Understanding this reaction aids in accurate interpretation of non-contrast CT scans.

Recognizing this benign entity can prevent unnecessary interventions.