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

Testing for carbonates (CO3^2-)

20 practice questions

Start practising (8 questions)

Practice questions

1–8 of 8 · Easy

  1. Question 1

    1 mark · Easy

    State the name of the gas given off when dilute hydrochloric acid is added to a carbonate compound.

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  2. Question 2

    3 marks · Easy

    (a)

    State the reagent added to a sample to test for carbonate ions.

    [1 mark]
    (b)

    Describe what you would observe if carbonate ions are present after adding this reagent.

    [1 mark]
    (c)

    Explain how you would confirm that the gas produced is carbon dioxide.

    [1 mark]
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  3. Question 3

    3 marks · Easy

    Test results for carbonate ions.
    SampleDilute acid addedFizzing observedGas turns limewater cloudy
    XYesYesYes
    YYesNo-
    ZYesYesNo
    (a)

    Which sample(s) most likely contain carbonate ions? Explain your answer.

    [1 mark]
    (b)

    Suggest a possible identity for the gas produced from sample Z.

    [1 mark]
    (c)

    Explain why sample Y does not give the same results as X.

    [1 mark]
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  4. Question 4

    1 mark · Easy

    Write the ionic equation for the reaction between a carbonate ion and an acid.

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  5. Question 5

    3 marks · Easy

    (a)

    A teacher gives you a sample to test for carbonate ions. Describe fully how you would carry out this test.

    [2 marks]
    (b)

    State how you would know if carbonate ions are present.

    [1 mark]
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  6. Question 6

    2 marks · Easy

    A student tests 0.20 g of sodium carbonate powder by adding excess dilute hydrochloric acid. Calculate the maximum volume of carbon dioxide gas produced at room temperature and pressure (RTP), assuming that 1 mole of gas occupies 24 dm^3 at RTP. (Relative formula mass of Na2CO3 = 106)

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  7. Question 7

    2 marks · Easy

    A powder is suspected to contain carbonate ions (CO3^2-). Describe the two steps you would take to confirm the presence of carbonate ions in the powder and explain what results would show that carbonate ions are present.

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  8. Question 8

    2 marks · Easy

    A student wants to test for carbonate ions using dilute hydrochloric acid. She needs at least 0.22 g of carbon dioxide gas (CO2) to turn limewater cloudy. Calculate the minimum mass of sodium carbonate (Na2CO3) required to produce 0.22 g of CO2, assuming all of the carbonate reacts and only this gas is formed.

    Relative atomic masses: Na = 23, C = 12, O = 16

    Answer and see the solution →