SC2b ~ Filtration & Crystallisation

  • Created by: Hanna
  • Created on: 18-01-20 14:15


  • Crystallisation separates a solute from a solution
  • A filtrate is placed in an evaporating basin and heat is applied from a bunsen burner 
  • The heat will evaporate the filtrate and leave behind the solute 
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  • Filtration is used to separate an insoluble substance from a liquid 
  • Filter paper is used to filter a solution, leaving behind the insoluble substance (in the filter paper) and the filtrate (in the beaker) 

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Exam Style Questions

1) A student decides to make pure, dry copper chloride crystals. She adds an excess of insoluble copper chloride solution to dilute hydrochloric acid. Copper chloride solution forms. 

    a) Name a suitable method to remove excess copper carbonate from the solution.  (1 mark)

    b) The student leaves her copper chloride solution on a windowsill.
         (i) Explain why crystals of copper chloride form after a few days.  (3 marks)
         (ii) Give a reason that explains why the student pours away the remaining solution, and then pats the crystals with filter paper.  (1 mark)

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1a) Filtration.

1b) (i) Water evaporates (1) and the solution becomes saturated. (1) More water evaporates and crystals form. (1)

1b) (ii) It dries the crystals. 

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