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A student investigates how the pH changes during the neutralisation of dilute hydrochloric acid with calcium hydroxide.

Their method is described below:

  1. Measure 25 cm3 of dilute hydrochloric acid into a beaker.
  2. Record the initial pH of the acid.
  3. Add 0.5 g of calcium hydroxide powder to the beaker and stir thoroughly.
  4. Estimate the pH of the mixture by matching the colour of universal indicator paper to a colour standard chart.
  5. Repeat steps 3 and 4 until the pH ceases to change.

Give one improvement to step 4 that would produce more accurate results.

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Acids Questions

Practise Edexcel GCSE Chemistry Acids 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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