Quantitative analysis
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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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Quantitative analysis Questions

Practise Edexcel GCSE Chemistry Quantitative analysis with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Quantitative analysis Questions

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