When we add salt to water, it dissolves. So, it becomes a solution.
But, when we add sand to water, it doesn't dissolve. Then, it becomes a suspension.
What is Suspension?
It is a heterogeneous mixture of small particles of solid in liquid
In this case, particles of solid do not dissolve in liquid but spread throughout the liquid
Example 1
Mixture of chalk and Water
Chalk particles do not dissolve in water but spread evenly throughout the water
Example 2
Mixture of Sand and Water
Sand Particles do not dissolve in water, they spread evenly throughout the water
Properties of Suspension
- It is heterogeneous mixture
- Size of solid particles is comparatively large (more than 100 nm) , so they can be seen easily
- Particles can be separated by filtration (using filter paper)
- Particles are not stable , they settle down after some time
- It shows Tyndall Effect ; if a beam of light passes through a suspension, it scatters it
