Year 11 Separating Techniques

  • Chromatography – involves solvent separation on a solid medium and uses the different rate of movement of the solvent
  • Decanting – separating a liquid from a solid/liquid by pouring out the top layer leaving the unwanted layer behind
  • Distillation takes advantage of differences in boiling points allowing for liquids to be separated. For example water and food dye.
  • Evaporation removes a liquid from a solution to leave a solid material. It is important to remember evaporation can occur at room temperature for water – it is different from boiling point. Increasing temperature increases rate of evaporation.
  • Filtration separates solids of different sizes or allows a solid to be removed from a liquid. Think of using filter paper to remove sucrose from a water solution.
  • Fractional distillation – separating solutions with similar boiling points.
  • Separating funnel – used to separate immiscible liquids with different densities.



Question 1.

A carbonate + acid –> carbon dioxide + water + salt

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