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Intermolecular Forces in Solutions

Intermolecular Forces in Solutions

The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...

Solvents

Solvents

A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...

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.

Aqueous Solutions and Heats of Hydration

Aqueous Solutions and Heats of Hydration

Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...

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:

Solution Formation

Solution Formation

There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
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Related Experiment Video

Updated: Jul 11, 2026

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Published on: August 10, 2016

Dissolution of wood in ionic liquids.

Ilkka Kilpeläinen¹, Haibo Xie, Alistair King

¹Department of Forest Biomaterials Sciences and Engineering, North Carolina State University, Raleigh, NC 27659-8005, USA. ilkka.kilpelainen@helsinki.fi

Journal of Agricultural and Food Chemistry

|October 3, 2007

Summary

Wood dissolution in ionic liquids (ILs) is now possible under mild conditions. This breakthrough enables new methods for wood characterization and biomass conversion into valuable products.

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Area of Science:

Biomass Conversion
Green Chemistry
Materials Science

Background:

Wood is a complex lignocellulosic material, posing challenges for efficient processing and valorization.
Existing methods for wood dissolution often require harsh conditions or lead to component degradation.

Purpose of the Study:

To investigate the efficacy of various imidazolium-based ionic liquids (ILs) for dissolving hardwoods and softwoods.
To explore the potential of ionic liquid-mediated wood dissolution for structural characterization and biomass conversion.

Main Methods:

Dissolution of wood samples (hardwoods and softwoods) using different imidazolium-based ionic liquids.
Acetylation of dissolved wood followed by solubility tests in chloroform.
Enzymatic hydrolysis of regenerated cellulose to glucose.
Structural and macromolecular characterization using proton nuclear magnetic resonance (NMR) spectroscopy and diffusion measurements.

Main Results:

Specific ionic liquids, like 1-butyl-3-methylimidazolium chloride, effectively dissolved wood sawdust and thermomechanical pulp (TMP) fibers.
Transparent wood solutions were achieved using 1-benzyl-3-methylimidazolium chloride, attributed to enhanced aromatic interactions with lignin.
Dissolved wood could be regenerated, and its cellulose component efficiently hydrolyzed to glucose.
Completely acetylated wood exhibited solubility in chloroform, enabling detailed NMR analysis without component isolation.

Conclusions:

Imidazolium-based ionic liquids offer a versatile platform for dissolving wood under gentle conditions.
This approach facilitates advanced structural and macromolecular characterization of wood components.
The method opens new avenues for converting woody biomass into biofuels, chemicals, and composite biomaterials.