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4.1 Acids

4.1 Acids

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Question 169

A student investigated how the pH of a mixture changed as calcium hydroxide powder was added to dilute nitric acid.

The student used the following method.

  • Step 1: Measure 25 cm3 of dilute nitric acid into a beaker using a measuring cylinder.
  • Step 2: Use a clean glass rod to transfer a drop of the acid onto a piece of universal indicator paper and record the pH.
  • Step 3: Add 0.5 g of calcium hydroxide to the acid in the beaker and stir thoroughly.
  • Step 4: Use the glass rod to transfer a drop of the mixture onto a fresh piece of universal indicator paper and record the pH.
  • Step 5: Repeat steps 3 and 4 until the recorded pH no longer changes.

Name a piece of equipment that could be used to measure the pH of the mixture more accurately than universal indicator paper.

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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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