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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section

Other alkaline solutions

18 practice questions

Start practising (8 questions)

Practice questions

1–8 of 8 · Normal

  1. Question 1

    2 marks · Normal

    State the name and the formula of the ion responsible for acidity in aqueous solutions.

    (a)

    Name of the ion:

    [1 mark]
    (b)

    Formula of the ion:

    [1 mark]
    Answer and see the solution →

  2. Question 2

    4 marks · Normal

    Potassium carbonate and ammonia both form alkaline solutions in water.

    (a)

    Write a balanced chemical equation to show how ammonia forms an alkaline solution when dissolved in water.

    [2 marks]
    (b)

    State the name and formula of the ion responsible for alkalinity in these solutions.

    [2 marks]
    Answer and see the solution →

  3. Question 3

    3 marks · Normal

    Explain why a solution of sodium carbonate in water is alkaline, even though sodium carbonate does not contain hydroxide ions in its original formula.

    Answer and see the solution →

  4. Question 4

    4 marks · Normal

    The following table shows the concentration of hydrogen ions in different solutions.

    Solution[H^+] (mol/dm³)
    A1.0 × 10^{-2}
    B1.0 × 10^{-6}
    C1.0 × 10^{-4}
    D1.0 × 10^{-8}
    (a)

    Which solution is the most acidic? Explain your answer.

    [2 marks]
    (b)

    Which solution is likely to have a pH above 7? Give the letter.

    [1 mark]
    (c)

    State the relationship between hydrogen ion concentration and acidity.

    [1 mark]
    Answer and see the solution →

  5. Question 5

    1 mark · Normal

    Which of the following substances forms an alkaline solution by reacting with water to produce hydroxide ions?

    1. A.Sodium chloride
    2. B.Potassium carbonate
    3. C.Calcium sulfate
    4. D.Ethanoic acid
    Answer and check →

  6. Question 6

    2 marks · Normal

    State the formula of the ion present in all alkaline solutions and give its charge.

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  7. Question 7

    4 marks · Normal

    Some cleaning products are described as 'alkaline'.

    (a)

    Ammonia is commonly found in cleaning products. State the ions that are produced when ammonia reacts with water.

    [2 marks]
    (b)

    Explain why solutions of ammonia are described as alkaline.

    [2 marks]
    Answer and see the solution →

  8. Question 8

    3 marks · Normal

    A student adds hydrochloric acid (HCl), at a concentration of 0.020 mol/dm³, to water. Hydrochloric acid completely dissociates into ions:

    Calculate the concentration of hydrogen ions (H⁺) in the solution after the HCl fully dissociates. Explain your reasoning.

    Answer and see the solution →