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DP IB Chemistry: SL

Topic Questions

Home / IB / Chemistry: SL / DP / Topic Questions / 8. Acids & Bases / 8.2 More About Acids / Structured Questions: Paper 2


8.2 More About Acids

Question 1a

Marks: 4
a)
A solution of hydrochloric acid of concentration 0.001 mol dm-3 has a pH value of 3. Suggest, giving a reason, the pH of the following solutions of acids:

i)
0.01 mol dm-3 hydrochloric acid
[2]

ii)
0.01 mol dm-3 ethanoic acid
[2]
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    Key Concepts
    pH & [H⁺]

    Question 1b

    Marks: 1
    b)
    A solution of 0.01 mol dm-3 ethanoic acid has a concentration of hydrogen ion of 1 x 10-4 mol dm-3.  Determine the percentage of ethanoic acid molecules that have dissociated.
    [1]
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      Key Concepts
      Acid-Base Calculations

      Question 1c

      Marks: 1
      c)
      Two separate titrations are carried out using 25.00 cm3 of 0.01 mol dm-3 solutions of hydrochloric acid followed by ethanoic acid, against 0.01 mol dm-3 sodium hydroxide. 
      State what difference(s) would be observed in the two titrations.  
      [1]
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        Key Concepts
        Acid-Base Titrations

        Question 1d

        Marks: 2
        d)
        Suggest a suitable indicator for the titration of hydrochloric acid and sodium hydroxide in part c), and state the colour changes observed.
        [2]
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          Key Concepts
          Acid-Base Titrations

          Question 2a

          Marks: 3
          a)
          Show how the ionic product for water is derived from the dissociation of water and give it units.
          [3]
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            Question 2b

            Marks: 1
            b)
            Determine the pH of 0.001 mol dm-3 sodium hydroxide.
            [1]
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              Key Concepts
              Acid-Base Calculations

              Question 2c

              Marks: 4
              c)
              Suggest, with a reason, how the magnitude of Kw changes with increasing temperature.
              [4]
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                Question 3a

                Marks: 1
                a)
                Malonic acid is a weak dibasic carboxylic acid with the formula C3H4O4. Draw the displayed structure of malonic acid.
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                  Question 3b

                  Marks: 2
                  b)
                  Suggest, with a reason, which of the two acids, ethanoic or malonic, has a higher pH?
                  [2]
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                    Question 3c

                    Marks: 1
                    c)
                    Apart from testing the pH, suggest how equimolar solutions of malonic acid and ethanoic acid may be distinguished.
                    [1]
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                      Question 3d

                      Marks: 2
                      d)
                      Write the formulas of two conjugate bases that can be formed from malonic acid.
                      [2]
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                        Question 4a

                        Marks: 2
                        a)
                        Marble chips are added separately to solutions of the same concentration of ethanoic acid and hydrochloric acid. State one similarity and one difference you would expect to observe in the reactions.
                        [2]
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                          Question 4b

                          Marks: 1
                          b)
                          Write an equation for the reaction between marble chips and ethanoic acid.
                          [1]
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                            Question 4c

                            Marks: 3
                            c)
                            Determine the volume, in cm3, of 2.25 mol dm-3 ethanoic acid needed to completely react with 1.50 g of marble chips. 
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                              Question 4d

                              Marks: 3
                              d)
                              Determine the volume of CO2, in cm3, produced at 273 K and 101 kPa in part c).
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                                Key Concepts
                                Ideal Gas Equation