Solutions

A mixture of two or more substances in a single phase.

One constituent is usually regarded as solvent and others as solutes.

 

Parts of Solutions:

Solute – the part of a solution that is being dissolved

Solvent – the part of a solution that dissolves the solute

Example of Colloids

Solid Sol: Pearl

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Gel: Butter

butter

Solid Foam: Marshmallow

marshmallow-puffs-marshmallows-600x400

Sol: Paint

eco-friendly-paint

Emulsion: Mayonnaise

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Foam: Whipped Cream

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Solid Aerosol: Dust

dust-storm

Aerosol: Cloud

cloud-computing-3

Types of Colloids

Dispersing medium Dispersed phase Name
Solid Solid Solid sol
Solid Liquid Gel
Solid Gas Solid foam
Liquid Solid Sol
Liquid Liquid Emulsion
Liquid Gas Foam
Gas Solid Solid aerosol
Gas Liquid Aerosol
  • Dispersing medium (external phase) – the constituent found in the greater extent in the colloid.
  • Dispersed phase (internal phase) – the constituent found in the lesser extent.
  • A further classification is as lyophilic (solvent attracting), lyophobic (solvent repelling) or association colloids (a mixture of the two).
  • If water is the dispersing medium, it is often known as a hydrosol.

source: http://www.chm.bris.ac.uk/webprojects2002/pdavies/types.html

What are Colloids?

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The mixture is also called a colloidal solution, colloidal system, or colloidal dispersion. The three forms in which all matter exists are solid, liquid or gas. Colloidal systems can be any combination of these states.

A colloidal system is not a true solution but it is not a suspension either because it does not settle out like a suspension will over time.

Colloids are larger than most inorganic molecules and remain suspended indefinitely. They are large molecules, such as proteins, or groups of molecules. They have many properties, depending on their large specific surface.

Colloid formation can be classified in two systems, namely reversible and irreversible. In an irreversible system, the products are so stable or removed so well that the original reactants cannot be reproduced. A reversible system is one in which the products can be made to react to reproduce the original reactants.

 

source: http://www.chm.bris.ac.uk/webprojects2002/pdavies/