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MMLU / An experiment was performed to determine the moles of carbon dioxide gas formed…

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question

An experiment was performed to determine the moles of carbon dioxide gas formed (collected over water) when an acid reacts with limestone. To do this, a piece of dry limestone was weighed. Then carbon dioxide was collected until the limestone disappeared. The atmospheric pressure was measured at 0.965 atm. The temperature was 295 K. The volume of CO2 was measured to the nearest mL and corrected for the vapor pressure of water. The student continuously got low results from what was expected. Can you suggest why?

choices

  1. Limestone is never pure CaCO3.
  2. Limestone is Ca(HCO3)2.
  3. Carbon dioxide is rather soluble in water.
  4. Perhaps there was not enough acid to dissolve all the limestone.

subject

high_school_chemistry

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