Prepare a Soluble Salt II (Edexcel IGCSE Chemistry)

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Prepare a soluble salt II

  • It is also possible to prepare a sample of a dry salt starting from an acid and an alkali
  • A titration can be used for this

Preparation of a soluble salt using a titraion

Using-titration-to-prepare-a-salt1, IGCSE & GCSE Chemistry revision notesDiagram showing the apparatus needed to prepare a salt by titration

 Method

  • Use a pipette to measure the alkali into a conical flask and add a few drops of indicator (phenolphthalein or methyl orange)
  • Add the acid into the burette and note the starting volume
  • Add the acid very slowly from the burette to the conical flask until the indicator changes to appropriate colour
  • Note and record the final volume of acid in burette and calculate the volume of acid added (starting volume of acid - final volume of acid)
  • Add this same volume of acid into the same volume of alkali without the indicator
  • Heat to partially evaporate, leaving a saturated solution
  • Leave to crystallise decant excess solution and allow crystals to dry

Examiner Tip

When evaporating the solution some water is left behind to allow for water of crystallisation in some salts and also to prevent the salt from overheating and decomposing.

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Stewart

Author: Stewart

Expertise: Chemistry Lead

Stewart has been an enthusiastic GCSE, IGCSE, A Level and IB teacher for more than 30 years in the UK as well as overseas, and has also been an examiner for IB and A Level. As a long-standing Head of Science, Stewart brings a wealth of experience to creating Exam Questions and revision materials for Save My Exams. Stewart specialises in Chemistry, but has also taught Physics and Environmental Systems and Societies.