<%@ Page Language="VB" ValidateRequest="False" %> There are many separation techniques including distillation, chromatography, centrifugation and evaporation : elaboratory.co.uk
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Seperation Techniques

The use of separation techniques is essential in analytical chemistry.

Scientists use separation techniques when a single substance needs to be extracted from a mixture of substances. The single substance is called a pure substance.

Combined substances, known as mixed substances, can come in various forms - separation techniques are thus required to extract from each of these different types of mixtures. These can include:

  • Solution: A solute plus a solvent is called a solution. When a solution contains a lot of solute in a given amount of solvent it is concentrated. When a solution dissolves all the solute it is termed saturated.
  • Suspension: When particles are suspended in a liquid it is called a suspension.
  • Liquid/Liquid: When Liquid/Liquid mixtures mix together completely to form one single liquid they are termed Miscible.

    Methods of purification and separation can vary and include:

  • Solvent Extraction: An organic liquid used for solvent extraction must be a good solvent for the solute(s) to be extracted
  • Extraction of Metal: Many organic compounds form complexes with metal cations - these are more soluble in organic solvents than in water and hence are extractable
  • Ion Exchange: Usually performed using a glass column packed with ion-exchange resin beads, this has many uses in analytical chemistry
  • Chromatography: This refers any method in which the components are distributed between a stationary phase and a moving phase
  • Separation by precipitation: These are valuable for separating ions from one another

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