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4.1 Acids

4.1 Acids

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Question 184

A student is investigating how the pH of a solution changes when calcium carbonate powder is added to dilute hydrochloric acid.

The student's method is as follows:

  1. Measure 25.0 cm3 of dilute hydrochloric acid into a beaker using a measuring cylinder.
  2. Measure and record the pH of the acid using a pH probe.
  3. Add a 0.5 g spatula measure of calcium carbonate powder to the beaker and stir.
  4. Measure and record the pH of the mixture.
  5. Repeat steps 3 and 4 until there is no further change in pH.

Name a piece of laboratory equipment that could be used to measure the 25.0 cm3 of dilute hydrochloric acid more accurately than a measuring cylinder.

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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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