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Which kinds of mixtures can be separated by filtration?
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filtration
Tap water filtration system.
Filtration is a process used to separate mixtures consisting of solid particles suspended within a fluid, which may be either a liquid or a gas.12
This method relies on a filter medium that allows the fluid to pass through while retaining the solid particles. Common applications include:1
- Solid-Liquid Mixtures: This is the most frequent use of filtration, such as separating a precipitate from a solution after selective precipitation or removing suspended crystals from a liquid.23
- Solid-Gas Mixtures: Filtration is also utilized in laboratory settings to remove solid particles from gaseous fluids.2
The effectiveness of the separation depends on the dimensions of the particles and the pore size of the filter medium. While filtration is often used for gross separations, it can be highly sensitive to particle size when the pore sizes of the medium are uniform. To facilitate the process, a driving force—such as a pressure difference or a partial vacuum—is typically applied to move the fluid through the filter.231