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4.1 Acids

4.1 Acids

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Question 153

An industrial process produces anhydrous hydrogen chloride (HClHClHCl) gas as a waste product.

A student is given a sample of this dry gas to test.

The student suggests the following method to test for the hydrogen chloride gas:

  • Step 1: Take a piece of dry, red litmus paper.
  • Step 2: Place the dry litmus paper into the dry gas sample.
  • Step 3: Observe any change in colour of the litmus paper.

This test for hydrogen chloride will not work.

Give two changes that should be made to this test for it to work.

[2]
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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