Question

Write down the properties of solution suspension colloid

Answer 1

Properties of suspension

i) Heterogeneous nature: a suspension is a heterogeneous system.

ii) Visibility: the particles in a suspension can be seen with naked eyes or under a simple microscope.

iii) Particle Size: in a suspension, the size of the particles is of the order of 10-7 make or larger.

iv) Sedimentation: the particles in a suspension travel tendency to settle down. Very fine particles, however, remain suspended in the medium.

v) Separation by filtration: Larger particles in a suspension can be separated from the liquid or air by the filtration. Colloids: Colloids are commonly called sols.

Properties of Colloidal Solutions

1. General Properties: General properties of colloidal solutions are given in difference between colloid and true solution.

 

2.  Optical Properties:

(i)  
Brownian movement

This continuous and rapid zig-zag motion of the colloidal particles is called Brownian movement. This motion is independent of the nature of the colloidal particles. It is more rapid when the size of the particles is small and the solution is less viscous.

ii)  Tyndall Effect: Tyndall (1869) observed that when a strong beam of light is focused on a colloidal solution the path of the beam becomes visible and when viewed through microscope placed at right angle to the path of light (ultramicroscopically), the colloidal particles appear as pin points of light moving against a dark background in a colloidal solution. This phenomenon is known as Tyndall effect and the illuminated path is called Tyndall cone. This phenomenon is not observed in case of true solution.

 

Answer 2

PROPERTIES OF SOLUTION

: A solution is a homogeneous mixture of two or more substances.

: The particles of solute in a solution cannot be seen by the naked eye.

: A solution does not allow beams of light to scatter.

: A solution is stable.

: The solute from a solution cannot be separated by filtration (or mechanically).

: It is composed of only one phase.

PROPERTIES OF SUSPENSION

: A suspension is a heterogeneous solution in which, while standing, several particles move out of the mixture.

: In a suspension, the volume of the solvent particles is quite high. It has a length of more than 100 mm.

: It is easy to see the molecules of a suspension.

: A suspension’s particles don’t go through a filter paper. Thus, filtration can separate a suspension.

: There’s shaky suspension. After some time a suspension’s particles settle down.

: Due to its large particle size, a suspension disperses a light beam that passes through it.

PROPERTIES OF COLLOID

: A colloid is a heterogeneous mixture.

: The size of particles of a colloid is too small to be individually seen by naked eyes.

: Colloids are big enough to scatter a beam of light passing through it and make its path visible.

: They do not settle down when left undisturbed, that is, a colloid is quite stable.

: They cannot be separated from the mixture by the process of filtration. But, a special technique of separation known as centrifugation can be used to separate the colloidal particles.