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Ideal Solutions or Mixtures

Ideal Solutions or Mixtures

From a molecular perspective, an ideal solution is one in which the intermolecular interactions between unlike molecules are, on average, the same as those between like molecules. This is the case for ideal gas mixtures, where the molecules are far apart and do not interact with each other. However, for condensed phases like liquids or solids, the molecules are close together and interact with each other. In an ideal solution, the molecules of different species are so similar to each other that...

Nonideal Two-Component Liquid Solutions

Nonideal Two-Component Liquid Solutions

Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...

Electrolyte and Nonelectrolyte Solutions

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.

Intermolecular Forces in Solutions

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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,...

Ideal Solutions

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According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the vapor phase...

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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.
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Related Experiment Video

Updated: May 28, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Ionic liquids form ideal solutions.

Andrew P Abbott¹, Gero Frisch, Holly Garrett

¹Chemistry Department, University of Leicester, Leicester, LE1 7RH, UK. apa1@le.ac.uk

Chemical Communications (Cambridge, England)

|October 6, 2011

Summary

This summary is machine-generated.

Understanding solute activity in ionic liquids is key for reactive species. This study reveals some metal salt solutions in ionic liquids behave ideally, enabling standard redox potential determination.

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Published on: November 27, 2015

Area of Science:

Electrochemistry
Physical Chemistry
Materials Science

Background:

Solute activity is crucial for optimizing reactive species in solutions.
Ionic liquids offer unique solvent properties for chemical reactions.
Accurate activity data is needed to determine thermodynamic properties like redox potentials.

Purpose of the Study:

To determine the activity of various metal salts dissolved in different ionic liquids.
To investigate the solution behavior of metal salts in ionic liquid media.
To assess the suitability of ionic liquids as solvents for electrochemical measurements.

Main Methods:

Experimental determination of solute activity coefficients.
Utilizing a range of metal salts and ionic liquid solvents.
Electrochemical measurements to determine standard redox potentials.

Main Results:

Observed diverse solution behaviors, with some systems mimicking non-polar solvents.
Identified several ionic liquid-metal salt solutions exhibiting near-ideal behavior up to 1 mol kg(-1).
Demonstrated the feasibility of determining standard redox potentials in these ideal solutions.

Conclusions:

Ionic liquids can serve as versatile solvents for studying solute activity.
Ideal solution behavior in certain ionic liquids facilitates accurate thermodynamic measurements.
This work provides essential data for the application of reactive species in ionic liquids.