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4.1 Acids

4.1 Acids

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Question 23

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]
Markscheme

4.1 Acids Questions

  1. GCSE
  2. /Chemistry
  3. /4.1 Acids

276 exam-style questions on Edexcel GCSE Chemistry 4.1 Acids, covering 4.1.1 Acids, alkalis and the pH scale, 4.1.2 Hydrogen ion concentration and pH, 4.1.3 Dilute and concentrated, weak and strong acids, 4.1.4 Bases, alkalis and the reactions of acids, 4.1.5 Chemical tests for hydrogen and carbon dioxide, 4.1.6 Neutralisation as a reaction of acids with bases, 4.1.7 Preparing soluble salts, and 4.1.8 Solubility rules and preparing insoluble salts. Each one has a worked solution and a mark scheme showing where the marks go.

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