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4.1 Acids

4.1 Acids

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Question 161

An environmental chemist is investigating how the pH of acidic industrial runoff changes during a treatment process.

The chemist used the following method:

  • Step 1: Measure 50 cm3 of the acidic runoff (containing dilute sulfuric acid) into a beaker using a measuring cylinder.
  • Step 2: Use a clean glass rod to transfer a single drop of the runoff onto a piece of universal indicator paper and record the pH.
  • Step 3: Add 0.2 g of magnesium oxide powder to the beaker and stir thoroughly.
  • Step 4: Use the glass rod to transfer a drop of the resulting 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.

State the name of an instrument that could be used to measure the pH of the mixture in Step 4 with greater precision 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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