Subject: Chemistry Chapter: Is matter around us pure?
Topic: Heterogeneous Mixtures-Suspensions and Colloids
A suspension is a heterogeneous mixture of two or more substances. In it, the particles are suspended throughout the solution in bulk and can be easily seen by naked eyes. Here, the particles of the solute do not dissolve in the solution and are rather suspended. Particles of the suspension are large enough to scatter the rays of light and the path of ray is visible through it.General Characteristics and Properties of Suspension
Suspensions are a heterogeneous mixture of two or more substances.
Particles of the solute do not dissolve in the solvent rather they remain suspended in bulk throughout.
The size of particles of suspension is large enough to be visible from naked eyes. They are greater than 1 nanometer (?10?^(-9) meter).
It shows Tyndall effect because of their large size of particles.
When it is left for some time, particles get settled in the bottom. Therefore, it is not stable.
The particles in it can be separated through the process of filtration.
It does not scatter light when particles are settled because in this case suspension breaks.
Colloidal solutions, or colloidal suspensions, are nothing but a mixture in which the substances are regularly suspended in a fluid. A colloid is a very tiny and small material that is spread out uniformly all through another substance.Colloidal systems can occur in any of the three key states of matter gas, liquid or solid. However, a colloidal solution usually refers to a liquid concoction. The primary distinguishing feature between a true solution and a colloidal solution is fundamentally the dimensions of the constituent parts.
True Solution and Colloidal Solution
In a true solution, like salt water, NaCl molecules are totally mixed in the water, and the solution can pass through a semi-permeable film without getting divided. On the other hand, in a colloidal solution, the units are bigger and they don’t liquefy. However, they are equally dispersed all through a liquid. As such these units will not pass through a membrane as the liquid does.
Classification of Colloidal Solution
Colloidal Solutions are divided into the following types:
Foam: Foam is a solution of a gas in a liquid. The substance being dispersed would be the gas, triggering the fluid to become frothy and foamy. A sample of this would be shaving cream.
Emulsion: An emulsion is a combination of liquids. It is basically when one liquid is consistently dispersed all through another liquid. A sample of this would be mayonnaise or milk. Learn more about Emulsion here.
Sol: The third form is called a sol. A sol is a combination of a solid that is evenly dispersed throughout a fluid. Samples of sols include paint, blood and silver aquasols.
Hydrocolloid: A hydrocolloid is a more detailed form of a colloidal solution. In this solution, the fluid of a precise material is properly disseminated in water. Hydrocolloids are usually used in food products to influence texture, as in sauces or gelatins.
Reversible or Irreversible Colloids: The colloidal solutions can be additionally labeled as being reversible or irreversible. In reversible colloids, the two materials can be effortlessly divided again whereas, in irreversible ones, this is not possible.
Let us learn more about them in this video.
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