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4.1 Acids

4.1 Acids

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Question 131

A student determines the concentration of a sample of nitric acid by titrating it against a standard solution of potassium hydroxide.

25.0 cm3 of the nitric acid is measured into a conical flask, and a few drops of phenolphthalein indicator are added.

Potassium hydroxide solution is slowly run into the flask from a burette until the reaction reaches its end point.

Describe the colour change observed in the conical flask at the end point of this titration.

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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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