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Explain how to prepare, separate, and purify soluble salts through the reaction of an acid with: (a) an alkali using titration, (b) excess metal, (c) excess insoluble base, and (d) excess insoluble carbonate.

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Cambridge IGCSE ChemistryAcids, bases and saltsCore contentPractical objective

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Quick explanation

Explain how to prepare, separate, and purify soluble salts through the reaction of an acid with: (a) an alkali using titration, (b) excess metal, (c) excess insoluble base, and (d) excess insoluble carbonate

  • This point belongs to Preparation of salts, especially Preparation of salts outcomes.
  • You need to be able to explain how to prepare, separate, and purify soluble salts through the reaction of an acid with: (a) an alkali using titration, (b) excess metal, (c) excess insoluble base, and (d) excess insoluble carbonate.
  • The key ideas to know are Describe, Explain, and Identify.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DescribeExplainIdentify

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Paper 6 structured question: Preparation of salts

Paper 6Alternative to PracticalPractical1 marks

Method

Method for Preparing a Soluble Salt

To prepare sodium chloride from hydrochloric acid and sodium hydroxide, follow these steps: 1. Measure a specific volume of hydrochloric acid using a pipette. 2. Add a few drops of phenolphthalein indicator. 3. Titrate with sodium hydroxide until the solution turns pink, indicating neutralization. 4. Filter the solution to remove any unreacted sodium hydroxide. 5. Evaporate the filtrate to obtain sodium chloride crystals.

  1. a

    State Identify the independent variable in this method.

    Aim for approximately 1 distinct marking point.

    [1]
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