Separation Techniques

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Separation of Mixtures

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Presentation transcript:

Separation Techniques

Method 1: Sedimentation Sedimentation is the tendency for particles in suspension to settle out of the fluid in which they mixed.

Method 2: Decantation Decantation is a fast method for separating a mixture of a heavier solid and a liquid

For separating the mixture of water & sand, first, we should let the sand to settle on the bottom of the container (sedimentation). Then we pour off the water at the top into the other container using a glass rod. This method cannot be used to separate the mixture of a liquid and a light solid, like chalk in water

Method 3: Filtration Filtration is a method use to separate particles based on their size. The mixture is poured through filter paper – this is paper that is porous (small openings) which allows small particles such as water to pass through and larger particles (such as chalk) to remain in the filter paper.

The substance that passes through is called the filtrate. The substance left in the filter paper is called the residue.

Filtration process

Method 4: Distillation Distillation is based on the idea that different substances have different boiling points. A mixture (such as salt and water) is heated until one of the substances (such as water) reaches its boiling point and becomes a vapour.

The vapour rises, is collected, and then is condensed (cooled) back into a liquid. This process continues until all the liquid (water) is boiled off. The liquid collected is called the distillate.

Distillation apparatus