Question

Define sol?

Answer 1

We need to know that the sol is a colloid. The colloid is a material containing particles of considerably larger size than atoms. But they are too small and cannot be seen by eyes. The colloid has continuous phase and dispersed phase. But the solute has only one phase and that is, solute and solvent. And the classes of colloids are solid emulsion, liquid emulsion, liquid aerosol and foam.

Complete answer:
The sol is a colloid which is made up of very small particles which are in a continuous liquid medium. And the sales are completely stable which shows the Tyndall effect. Some examples are cell fluids, paint, mud, blood, antacids etc. The sols can be prepared artificially by condensation method or dispersion method. The dispersion method contains the grinding solids to the colloidal dimension. By using dispersion agents, the sols will maintain the stability. And it is mainly used for the sol – gel process. The dispersion medium of sol is liquid and the dispersed phase is solid. When the solid gets undisturbed, the solute particles will settle down. The sol – gel techniques can be used to make thin films, fine powders, fibers, monoliths, microspheres, etc. And it has some applications, involving catalyst, lenses, high strength ceramics, and preparation of nanoparticles etc.

Note:
As we know that the colloid is a heterogeneous mixture and it has a very small size between$1nm\, - 100nm$. And the colloidal particles will exhibit the Tyndall effect and they are highly stable and it is a non – crystalline solid. The colloid cannot be separate by using an ordinary method like centrifugation, filtration etc. Milk, muddy water, gelatin, butter etc, are examples of colloids.