Chapitre 12
Solutions et colloïdes
Formation de la solution
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 ...
Forces intermoléculaires dans les 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 ...
Enthalpie de solution
There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
A decrease in the internal energy of the system (an ...
Solutions aqueuses et enthalpie d'hydratation
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 ...
Équilibre et saturation de la solution
Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this ...
Propriétés physiques affectant la solubilité
Solutions of Gases in Liquids
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute ...
Exprimer la concentration d'une solution
A solute is a component of a solution that is typically present at a much lower concentration than the solvent. Solute concentrations are often described ...
Abaissement de la pression de vapeur saturante
The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
...
Solutions idéales
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 ...
La loi de l'ébulliométrie et la loi de la cryométrie
Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the ...
Osmose et pression osmotique des solutions
A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, ...
Électrolytes : facteur de van 't Hoff
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species ...
Colloïdes
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera ...
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