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Particles and Purification - Methods in purification

6 important questions on Particles and Purification - Methods in purification

What is a solution

A solution contains a solid dissolved in a solvent. The dissolved solid is called the solute. The liquid that dissolves the solid is called the solvent

How does filtration work

An undissolved solid can be dissolved from a solution or liquid by passing through a piece of filter paper in a filter funnel. The solution which passes through the filter paper is the filtrate. The solid that stays on the filter paper is called the residue

What is a centrifuge

A centrifuge is a machine which spins at very high speeds. The spinning pulls the solid to the bottom of the tube. After it's done you decant the liquid from the solid

How does crystallisation work

Crystallisation is used to obtain a crystalline solid from a solution. The solution is gently heated in an evaporating basin to concentrate it. The solvent is then evaporated till the crystallisation point is reached. The concentrated solution is then left to cool. Crystals eventually begin to form at the bottom of the basin

How do you know the crystallisation point is reached

You can tell by placing a drop of solution on a cold tile. If crystals form quickly the point has been reached

How does solvent extraction work

Solvent extraction can be used to separate two solutes dissolved in a solvent. A second solvent is used to extract one of the solids from the first solvent.

The question on the page originate from the summary of the following study material:

Chemistry for IGCSE | 9781408500187 | Roger Norris, et al

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