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

Other alkaline solutions

18 practice questions

Start practising (7 questions)

Practice questions

1–7 of 7 · Easy

  1. Question 1

    1 mark · Easy

    State the ion responsible for the alkalinity of sodium hydroxide solution.

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  2. Question 2

    3 marks · Easy

    Potassium carbonate (K_2CO_3) can make water alkaline without containing hydroxide ions in its formula.

    (a)

    Write the formula of the ion that makes a solution alkaline.

    [1 mark]
    (b)

    Explain, using a chemical equation, how potassium carbonate forms an alkaline solution in water.

    [2 marks]
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  3. Question 3

    2 marks · Easy

    Magnesium hydroxide (Mg(OH)_2) is often used as an antacid. It does not dissolve well in water, but any dissolved part is alkaline. Explain why a solution of magnesium hydroxide is alkaline.

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  4. Question 4

    1 mark · Easy

    Name a substance, other than ammonia, that forms an alkaline solution when dissolved in water.

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  5. Question 5

    3 marks · Easy

    Read the passage and answer the questions below. Acids release hydrogen ions (H^+) in water, making the solution acidic.

    (a)

    Name the ion formed in solution when hydrochloric acid is added to water.

    [1 mark]
    (b)

    Give the symbol for this ion.

    [1 mark]
    (c)

    Explain, using the equation, what happens when HCl is dissolved in water.

    [1 mark]
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  6. Question 6

    3 marks · Easy

    The following table shows the formulae of several acids. Use the table to answer the questions below.

    Table 1. Some common acids and their formulae.
    AcidFormula
    Hydrochloric acidHCl
    Nitric acidHNO₃
    Sulfuric acidH₂SO₄
    Phosphoric acidH₃PO₄
    Ethanoic acidCH₃COOH
    (a)

    Identify the ion that all acids in the table produce when dissolved in water.

    [1 mark]
    (b)

    State the chemical symbol and charge of this ion.

    [1 mark]
    (c)

    Explain, using the formulae in the table, how you know that each acid can form this ion.

    [1 mark]
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  7. Question 7

    2 marks · Easy

    A student dissolves 0.20 mol of sodium carbonate (Na_2CO_3) in enough water to make 1.0 dm³ of solution. Sodium carbonate forms an alkaline solution because it reacts to produce hydroxide ions.

    Calculate the concentration of carbonate ions (CO_3^{2-}) present in the solution. Give your answer in mol/dm³.

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