16. In what respect does a true solution differ from a colloidal solution and a suspension? How will you test whether a given solution is a colloidal solution or a suspension?
Comparison of properties of solution, colloidal solution and suspension.
|
Property |
Solution |
Colloidal solution |
Suspension |
|
(1) Appearance
|
Homogeneous and transparent
|
Heterogeneous and transluscent |
Heterogeneous and opaque |
|
(2) Particle size
|
< 1 nm (10–7 cm)
|
1 nm—100 nm (10–7 cm—10–5 cm) |
> 100 nm (10–5 cm)
|
|
(3) Visibility
|
Particles are not visible even with a powerful microscope
|
Particles can be seen with a high power microscope
|
Particles can be seen with naked eyes
|
|
(4) Stability
|
Stable |
Stable
|
Unstable |
|
(5) Diffusion |
Diffuse rapidly NaCl dissolved in water |
Diffuse slowly Blood |
Do not diffuse Mud water |
Test of a colloidal solution or a suspension.
(i) A colloidal solution is turbid and particles settle down on adding a salt whereas no change is noticed when a salt is added to a true solution.
(ii) If the particles in a heterogeneous and opaque solution can be seen with naked eyes and get settled on keeping, then it is a suspension.
