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    (Original post by Ari Ben Canaan)
    Wikipedia says Ammonia, Nitrogen, Water and SO2 are eveolved.
    Thats only on really strong heating.You don't need to know all these-
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    (Original post by Ari Ben Canaan)
    One other question.

    During a chemistry practical I have noticed that in some tests that I observe fizzing upon adding HCl.

    Usually this means the presence of a carbonate ion.

    However, the examiner's report often states that it is necessary to test the evolved gas with limewater.

    How would I do this ? Usually I am carrying the test out in a small test tube and I am never provided with a gas syringe, connecting tubes or other apparatus.

    So it is a logistics issue of getting the gas into a small amount of limewater.
    There is a method that is often used and quite successful if done carefully.

    Limewater in a test tube 1/3 full.

    Squeeze a dropping pipette and hold it shut.
    Hold it in the suspected CO2 gas (taking care not to touch the liquid)
    Release the bulb.

    [cycle starts here]
    Remove the pipette and put it into the limewater.
    Squeeze to expel the gas (do not release the bulb)
    Place into the suspected CO2 once again.
    Release the bulb.
    [end cycle]

    Repeat cycles until a change is noted in the limewater.
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    (Original post by ForensicShoe)

    :rolleyes:


    Ahhh the Haber process - GCSE Chemisty :love:
    Isn't the Haber process the production of ammonia from nitrogen and hydrogen gasses?

    :rolleyes:
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    (Original post by maturestudy)
    Isn't the Haber process the production of ammonia from nitrogen and hydrogen gasses?

    :rolleyes:
    Shows how much I revised for that exam :cool:
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    (Original post by charco)
    There is a method that is often used and quite successful if done carefully.

    Limewater in a test tube 1/3 full.

    Squeeze a dropping pipette and hold it shut.
    Hold it in the suspected CO2 gas (taking care not to touch the liquid)
    Release the bulb.

    [cycle starts here]
    Remove the pipette and put it into the limewater.
    Squeeze to expel the gas (do not release the bulb)
    Place into the suspected CO2 once again.
    Release the bulb.
    [end cycle]

    Repeat cycles until a change is noted in the limewater.
    So you are saying that I should basically 'suck-up' some of the evolved gas with a pipette and release it into some limewater ?
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    (Original post by Ari Ben Canaan)
    So you are saying that I should basically 'suck-up' some of the evolved gas with a pipette and release it into some limewater ?
    That's about the gist of it
 
 
 
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