Suspension vs. Colloid: How Do They Differ?
In all three cases there are at least 2 phases in the system. An emulsion is a mixture of two insoluble liquids, a suspension is a mixture of a liquid and a solid state particles (also insoluble). Colloid is a special suspension where the size of the dispersed particles is smaller that 1 micrometer. These are distinguished from solutions, emulsions and suspensions because of some special physical properties (e.g. how they scatter light, don’t settle etc)
With these tidbits of knowledge, we can eliminate one of the three mixtures from our kitchen experiment. Oil and water do not mix well. With that mixture, the added components remain separate and do not mix completely, so we call it a heterogeneous mixture.
What are some examples of colloids and suspensions?
Aside from the dimensions of the dispersed phase, the other thing that is required to qualify a suspension as a coiloid is the stability of the system; it should not separate out into two phases on standing (or at least not for an extremely long time).
Resources in this Lesson
1. Discuss with students three basic types of aqueous systems: solutions, colloids and suspensions. Review aqueous systems, pure substances, and mixtures. Discuss the difference between homogeneous mixtures and heterogeneous mixtures.
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In this chapter of chemistry, we will introduce you to another form of matter, known as colloids and their solution, known as a colloidal solution. We are sure you know quite a bit about these solutions. However, we are going to dig further into the chapter, looking at their properties, types, and examples.
What is the Difference Between a Solution And a Suspension?
Both solutions and suspensions are mixtures of two or more components and neither of them have components that are chemically bonded together. Components in both a solution and a suspension can be separated based on their physical properties of density, solubility or size.
Water solutions of many substances (sugar, etc.), easily pass through plant or animal semipermeable barriers, while others such as gelatin do not pass through them. The first substances are called crystalloids, and the second are called colloids.
Properties of Colloidal Suspension
Mixtures are combinations of several substances. Each of the substances retains its physical properties. There are no new substances created. This is in contrast to a chemical reaction in which two or more reactants make new products.