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Precipitation of Ions

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

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.

Electron Affinity

Electron Affinity

The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

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Related Experiment Video

Updated: Jun 1, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

Dopaminium perchlorate.

Davar M Boghaei, Sahar Baniyaghoob, Mohammad Mahdi Najafpour

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This study details the crystal structure of 2-(3,4-dihydroxy-phen-yl)ethanaminium perchlorate. The compound forms a three-dimensional network through hydrogen bonding between cations and anions.

Area of Science:

Crystallography
Chemical Physics
Materials Science

Background:

Understanding the supramolecular assembly of organic salts is crucial for designing new materials.
Hydrogen bonding plays a key role in dictating crystal packing and material properties.

Purpose of the Study:

To elucidate the crystal structure of 2-(3,4-dihydroxy-phen-yl)ethanaminium perchlorate.
To investigate the intermolecular interactions governing its three-dimensional structure.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
Analysis of hydrogen bonding networks (N-H⋯O and O-H⋯O) was performed.

Main Results:

The crystal structure reveals a 3D network formed by the title compound.

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Published on: November 22, 2016

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

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Last Updated: Jun 1, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Published on: November 22, 2016

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

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Published on: October 1, 2019

Intermolecular hydrogen bonds, specifically N-H⋯O and O-H⋯O, link the cations and anions.

The chemical formula is C(8)H(12)NO(2) (+)·ClO(4) (-).

Conclusions:

The crystal structure of 2-(3,4-dihydroxy-phen-yl)ethanaminium perchlorate is characterized by a robust three-dimensional hydrogen-bonded network.
This structural motif highlights the importance of hydrogen bonding in organizing organic salt crystals.