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4.1 Acids

4.1 Acids

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Question 5

A student investigated the change in pH when 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 place a drop of the acid onto a piece of universal indicator paper and record the pH by comparing it to a color chart.
  • Step 3: Add one spatula of calcium hydroxide powder to the beaker and stir thoroughly.
  • Step 4: Use the glass rod to place a drop of the mixture onto a new piece of universal indicator paper and record the pH.
  • Step 5: Repeat steps 3 and 4 until there is no further change in the pH value.

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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