Chemistry gas experiment question

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    A student measured the volume of carbon dioxide produced when marble chips, CaCO3, react with dilute hydrochloric acid, HCl.
    Which of the following can explain why the student measured a smaller volume than expected?
    Some CO2 is still in the delivery tube.
    Some CO2 dissolved in the water.
    Some gas escaped when the marble chips were added to the acid.

    Which of the above contributed to the smaller vol?
    The reason I ask is that i think all are plausible answers, with the exception of maybe the first as CO2 is denser than air and is collected via downward delivery so none can be left in delivery tube.
    Thanks!!
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    Just quoting in Danny Dorito so she can move the thread if needed :wizard:
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    (Original post by IGCSETANK)
    A student measured the volume of carbon dioxide produced when marble chips, CaCO3, react with dilute hydrochloric acid, HCl.
    Which of the following can explain why the student measured a smaller volume than expected?
    Some CO2 is still in the delivery tube.
    Some CO2 dissolved in the water.
    Some gas escaped when the marble chips were added to the acid.

    Which of the above contributed to the smaller vol?
    The reason I ask is that i think all are plausible answers, with the exception of maybe the first as CO2 is denser than air and is collected via downward delivery so none can be left in delivery tube.
    Thanks!!
    well c02 won't still be in the delivery tube cause it's a gas.
    Some gas escaped when the marble chips were added to the acid - is logical and in my opinion the correct answer.
 
 
 
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