Question

Show the different types of colloids with examples.

Answer 1

We know that a phase which is a separated mixture is named as colloid during which one substance of microscopically soluble or insoluble particle is suspended throughout another substance. The colloid has size of the particle as 1 and 100 nanometer. We have to remember that some colloids are translucent when the light passes through the solution which gets scattered which is known as Tyndall effect.

Complete step by step answer:
There are two sorts of colloids and that they are (1) Lyophilic colloids, and (2) Lyophobic colloids.
Now, we see lyophilic colloids.
The colloidal solutions during which the dispersed particles have strong affinity towards water are called as lyophilic sol which are often easily formed by direct heating or mixing. These sols are reversible in nature and stable, and can't be coagulated easily. The force of attraction between dispersed particles and dispersed medium is high thanks to the formation of hydrogen bonds. Example: Gelatin, starch.
Let us discuss lyophobic colloids.
The colloidal solutions during which the dispersed phase has low affinity towards dispersed medium are called as lyophobic sol and that they can't be formed by direct heating or mixing. They’re prepared by special methods. These sols are permanent in nature and unsteady, easily coagulated. Example: metal dissolved in water.
The Lyophilic sols coagulate easily by the addition of a huge amount of electrolyte whereas lyophobic sols are easily coagulated by the addition of a bit of electrolyte.

Note: We must remember that the minimum mass of colloid which is added to stop the coagulation of red gold is named as gold number. The gold number and therefore the protecting power are inversely proportional which suggests smaller the gold number higher the protective power Lyophobic colloid is shielded from coagulation by using Lyophilic protective colloid. The protective power of the colloid can be predicted from the gold number value.
Example: The ice particles are shielded from coagulation by adding gelatin.