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Chemistry · May / June 2020 · Paper 61 · Question 2

0620

As printed in the paper

The question as text

A student investigated the reaction between dilute hydrochloric acid and two different aqueous solutions of sodium carbonate, solution E and solution F. Three experiments were done.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 2(a)[5]

    all six burette readings correct

    10.2 / 0.0
    25.9 / 5.5
    33.0 / 2.4

    all readings to 1 dp

    initial and final readings the correct way round

    all subtractions correct to calculate volume added

    10.2
    20.4
    30.6

  • 2(b)[2]

    (from) yellow

    (to) red / pink / orange

  • 2(c)[2]

    solution F more concentrated (than solution E)

    1.5 times

  • 2(d)[1]

    1:2

  • 2(e)[2]

    15.3

    cm3

  • 2(f)(i)[1]

    clean / remove residues from previous experiment

  • 2(f)(ii)[1]

    does not change amount of E / F

    or

    volumes / amounts already measured

  • 2(g)[4]

    errors

    any two from:

    using measuring cylinder
    missing endpoint / misjudging colour change
    not repeating

    improvements

    any two from:

    use pipette (in place of measuring cylinder)
    add more slowly
    repeat (and find mean)
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