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4.1 Acids

4.1 Acids

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Question 95

A manufacturer of dry bath bombs uses anhydrous citric acid powder as one of the key ingredients.

To verify the acidic nature of a fresh batch of this dry powder, a quality control technician proposes the following method:

  • Step 1: Take a piece of dry, red litmus paper.
  • Step 2: Press the dry litmus paper firmly into the dry citric acid powder.
  • Step 3: Observe any change in colour of the litmus paper.

This test will not work.

Give two changes that must be made to this method for the test to successfully show that citric acid is acidic.

[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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