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An experiment is planned to investigate the change in pH as calcium carbonate powder is added to 40 cm3 of dilute nitric acid.

The student's proposed method is:

  • Step 1: Pour dilute nitric acid up to the 40 cm3 mark on a beaker.
  • Step 2: Add one spatula scoop of calcium carbonate powder and stir.
  • Step 3: Record the pH of the mixture.
  • Step 4: Repeat steps 2 and 3 until the pH no longer changes.

State two changes the student should make to this method so that the volume of dilute nitric acid and the quantity of calcium carbonate are measured more accurately.

[2]

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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Acids Questions

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