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4.1 Acids

4.1 Acids

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Question 139

An environmental chemist is investigating how the pH of simulated acid rain (dilute sulfuric acid) changes as it filters through a column of crushed limestone (calcium carbonate).

The chemist uses the following procedure:

  • Step 1: Measure 50 cm3 of simulated acid rain into a beaker.
  • Step 2: Use a clean glass rod to transfer a drop of the acid onto a strip of universal indicator paper and record the pH by comparing it to a colour chart.
  • Step 3: Pour the acid rain through a column containing 10 g of crushed limestone and collect the runoff in a clean beaker.
  • Step 4: Transfer a drop of the collected runoff onto a new strip of universal indicator paper and record the pH.
  • Step 5: Repeat steps 3 and 4 using the same liquid with fresh columns of limestone until no further change in pH is observed.

Name a piece of equipment that could be used to measure the pH of the runoff 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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