Filtration

 

What is filtration?

Filtration is a way of separating a solid that does not dissolve in a liquid. When a mixture of rock salt and water is filtered:

The rock salt remains in the filter paper (it is called the residue) the water goes through the filter paper (it is called the filtrate).

 

 

 

What is filtration used for?

If a substance doesn’t dissolve in a solvent, it is called insoluble. For example, sand does not dissolve in water, meaning it is insoluble.

Filtration can be used to separate an insoluble solid. For example, water or salty water are liquids, and sand or stones are solids that do not dissolve in them.

When you filter a mixture of water and sand, the sand is left on the filter paper, this is the residue. the water goes through the filter paper, this is the filtrate.

 

 

How does filtration work?

Filtration works by using filter paper with many small holes that are too small to see. The liquid and any solutes that are dissolved in it can go through the holes in the filter paper. If the liquid has a solid that does not dissolve in it and has big particles, these big particles cannot go through the holes in the filter paper.

 

Summary:

 

• To separate a solid that does not dissolve from a liquid or a mixture of liquids, you can use filtration.
• Filtration involves putting a folded filter paper in the shape of a cone into a funnel and pouring the liquid and solid mixture through it.
• The liquid that goes through the filter paper is called the filtrate and the solid that stays on the filter paper is called the residue.