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  1. Complete the following table:

    pH of solution: Colour of universal indicator: Description:
    1 (ii) strong acid
    (i) green (iv)
    14 (iii) (v)

    (5 marks)

    (Marks available: 5)

    Answer

    Answer outline and marking scheme for question: 1

    (i) 7

    (ii) red

    (iii) blue/purple

    (iv) neutral

    (v) strong alkali

    (Total = 5 marks)

  2. The following equation shows the reaction that takes place between an acid and an alkali:

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    a) Name this type of reaction.

    (1 mark)

    b) Write a word equation that shows the reaction between nitric acid and potassium hydroxide.

    (1 mark)

    c) Write a symbol equation for the same reaction.

    (1 mark)

    (Marks available: 3)

    Answer

    Answer outline and marking scheme for question: 2

    a) Neutralisation.

    (1 mark)

    b) nitric acid + potassium hydroxide → potassium nitrate + water

    (Mark is gained for writing potassium nitrate as the salt).

    (1 mark)

    c) HNO3(aq) + KOH(aq) → KNO3(aq) + H20(aq)

    (1 mark)

    (Total = 3 marks)

  3. Complete the following equations:

    a) calcium carbonate + nitric acid =

    (1 mark)

    b) sodium carbonate + sulphuric acid =

    (1 mark)

    c) Ethanoic acid + sodium hydroxide =

    (1 mark)

    (Marks available: 3)

    Answer

    Answer outline and marking scheme for question: 3

    a) = calcium nitrate + carbon dioxide + water

    (1 mark)

    b) = sodium sulphate + water + carbon dioxide

    (1 mark)

    c) = sodium ethanoate + water

    (1 mark)

    (Total = 3 marks)

  4. Some salts are made in industry for use as fertilizers in farming.

    Complete the table showing acid and alkali used to make these salts

    Salt: Acid: Alkali:
    Ammonium nitrate
    Potassium phosphate

    (4 marks)

    (Marks available: 4)

    Answer

    Answer outline and marking scheme for question: 4

    Salt: Acid: Alkali:
    Ammonium nitrate Nitric acid Ammonium hydroxide
    (1 mark) (1 mark)
    Potassium phosphate Potassium hydroxide Phosphoric acid
    (1 mark) (1 mark)

    (Total = 4 marks)