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Solubility of Ionic Compounds

Solubility of Ionic Compounds

Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.

Factors Affecting Solubility

Factors Affecting Solubility

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 Chȃtelier’s principle. Consider the dissolution of silver iodide:

Theories of Dissolution: Diffusion Layer Model

Theories of Dissolution: Diffusion Layer Model

Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...

Molecular and Ionic Solids

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

Common Ion Effect

Common Ion Effect

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:

In Vitro Drug Dissolution: Alternative Methods

In Vitro Drug Dissolution: Alternative Methods

Alternative drug dissolution methods include the rotating bottle, intrinsic dissolution test, peristalsis, and the Franz diffusion cell method. The rotating bottle method involves meticulously rotating tightly capped controlled-release beads in a temperature-controlled bath. Periodic decanting of samples allows for residue assay, followed by refilling with fresh medium and testing at various pH levels to emulate the gastrointestinal tract conditions.In contrast, the intrinsic dissolution test...

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Updated: Feb 16, 2026

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Published on: August 10, 2016

Cellulose Crystal Dissolution in Imidazolium-Based Ionic Liquids: A Theoretical Study.

Takuya Uto¹, Kazuya Yamamoto¹, Jun-Ichi Kadokawa¹

¹Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University , 1-21-40 Korimoto, Kagoshima 890-0065, Japan.

The Journal of Physical Chemistry. B

|December 22, 2017

Summary

Ionic liquids (ILs) dissolve cellulose by breaking hydrogen bonds between chains. Powerful IL solvents effectively disperse cellulose, unlike weaker ones, revealing key dissolution mechanisms.

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Area of Science:

Materials Science
Chemical Engineering
Computational Chemistry

Background:

Cellulose's crystalline structure hinders solubility and processability.
Ionic liquids (ILs) show promise as cellulose solvents, but dissolution mechanisms are unclear.

Purpose of the Study:

To investigate the molecular mechanisms of cellulose dissolution in ionic liquids.
To elucidate the role of ionic liquid properties in cellulose solubility.

Main Methods:

Molecular dynamics (MD) simulations were used to model cellulose crystal dissolution.
Analysis of hydrogen bond cleavage and cellulose chain dispersion in various ILs.

Main Results:

Dissolution occurs via IL penetration, leading to hydrogen bond cleavage between cellulose chains.
High-dissolving-power ILs (e.g., 1-allyl-3-methylimidazolium chloride) effectively disperse cellulose.
Cellulose solubility correlates with the number of intermolecular hydrogen bonds in crystals.

Conclusions:

Both IL cations and anions contribute to breaking cellulose hydrogen bonds.
Effective cellulose dissolution requires sufficient hydrogen bond breakage, facilitated by powerful IL solvents.