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6.2 Quantitative analysis

6.2 Quantitative analysis

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Question 32

A student wrote the following brief method to determine the concentration of a sample of dilute hydrochloric acid:

  1. Fill a burette with standard sodium hydroxide solution.
  2. Use a pipette to transfer 25.0 cm3 of the hydrochloric acid into a conical flask.
  3. Add three drops of phenolphthalein indicator to the conical flask.
  4. Run the sodium hydroxide solution from the burette into the flask until the colour changes from colourless to pink.
  5. Record the final volume.

Further details are required to ensure the titration yields highly accurate results.

Explain two modifications or additional details that should be added to this method to improve the accuracy of the titration results.

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Markscheme

6.2 Quantitative analysis Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Quantitative analysis

157 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.

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