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4.1 Acids

4.1 Acids

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Question 53

A student investigates how the pH changes during the neutralisation of dilute hydrochloric acid with calcium hydroxide.

Their method is described below:

  1. Measure 25 cm3 of dilute hydrochloric acid into a beaker.
  2. Record the initial pH of the acid.
  3. Add 0.5 g of calcium hydroxide powder to the beaker and stir thoroughly.
  4. Estimate the pH of the mixture by matching the colour of universal indicator paper to a colour standard chart.
  5. Repeat steps 3 and 4 until the pH ceases to change.

Give one improvement to step 4 that would produce more accurate results.

[1]
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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