Question

Why do colloidal not seperate by
filtration?​

Answer 1

Answer:

They seperate through centrifugation.

Explanation:

Colloidal particles are too small. They are so small that they can pass through a filter paper and hence can't be separated by filtration as the particles pass through the pores.

However, a process called centrifugation can seperate a colloid into a liquid and solid particles. The liquid remains at the bottom and the solid at the top. This is because a force called centrifugal force acts on the particles which make them move outside the colloid and on the top. Examples: Milk into skim milk and cream, blood into plasma and blood cells, etc.

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Answer 2

colloids have very minute size that's why they are not seperated by filteration method