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DP IB Chemistry: SL

Topic Questions

Home / IB / Chemistry: SL / DP / Topic Questions / 8. Acids & Bases / 8.1 Theories & Reactions of Acids & Bases / Structured Questions: Paper 2


8.1 Theories & Reactions of Acids & Bases

Question 1a

Marks: 1
a)
Define a Brønsted–Lowry acid.
[1]
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    Question 1b

    Marks: 1
    b)
    Which species in the following reaction acts as a Brønsted-Lowry base.

    HSO4- (aq) + H3O+ (aq) rightwards harpoon over leftwards harpoon H2SO4 (aq) + H2O (l)

    [1]

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      Question 1c

      Marks: 1
      c)
      Which species in the following equation is acting as a Brønsted-Lowry acid.

      CO32- (aq) + H+ (aq) rightwards harpoon over leftwards harpoonHCO3- (aq)

      [1]

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        Question 1d

        Marks: 2
        d)
        Explain, using the Brønsted-Lowry theory, how water can act either as an acid or a base.
        [2]
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          Question 2a

          Marks: 1
          a)
          Describe the difference between an amphiprotic and amphoteric species.
          [1]
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            Key Concepts
            Amphiprotic Species

            Question 2b

            Marks: 2
            b)
            Write an equation to show ammonia, NH3, acting as both a Brønsted–Lowry base and a Brønsted–Lowry acid.

               Brønsted–Lowry base: ....................

               Brønsted–Lowry acid:  ....................

            [2]

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              Question 2c

              Marks: 1
              c)
              The equations for two acid-base reactions are given below.

              HCO3 (aq) + H2O (l)  H2CO3 (aq) + OH (aq)
              HCO3 (aq) + H2O (l) not stretchy rightwards harpoon over leftwards harpoon CO32– (aq) + H3O+ (aq)

                 Identify two different amphiprotic species in the above reactions.

              [1]

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                Key Concepts
                Amphiprotic Species

                Question 2d

                Marks: 2

                d)

                i)        State what is meant by the term conjugate base.

                [1]

                ii)       State the conjugate base of the hydroxide ion, OH– 

                [1]

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                  Question 3a

                  Marks: 1
                  a)
                  State an equation for the reaction of magnesium carbonate with dilute hydrochloric acid.
                  [1]
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                    Question 3b

                    Marks: 1
                    b)
                    State an equation for the reaction of lithium oxide with dilute nitric acid.
                    [1]
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                      Question 3c

                      Marks: 2
                      c)
                      Which acid and base would be required to produce ammonium sulfate, (NH4)2SO4.
                      [2]
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                        Key Concepts
                        Making Salts

                        Question 3d

                        Marks: 3
                        d)
                        Nitric acid and calcium hydroxide react together.

                        i)        State the type of reaction that takes place.

                        [1]

                        ii)       State the formula of the products of the reaction.

                        [1]

                        iii)      State the sign of the enthalpy change for this reaction.

                        [1]

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                          Key Concepts
                          Neutralization

                          Question 4a

                          Marks: 1
                          a)
                          Identify one conjugate acid-base pair in the reaction.
                           
                          OCl(aq) + H2O (l) rightwards harpoon over leftwards harpoon OH(aq) + HOCl (aq)
                          [1]
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                            Question 4b

                            Marks: 1
                            b)
                            State an equation for the reaction of aluminium hydroxide with dilute sulfuric acid.
                            [1]
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                              Question 4c

                              Marks: 1
                              c)
                              State an equation for the reaction of calcium hydrogencarbonate with dilute phosphoric acid, H3PO4.
                              [1]
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                                Question 4d

                                Marks: 3

                                d)      Write the formulae for the following:

                                i)   Carbonic acid.  [1]

                                ii)   Ammonium sulfate.  [1]

                                iii)   Magnesium ethanoate.  [1]

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