A student conducted an experiment to show CO2 is released during respiration . List two precautions that he must take for obtaining correct observations.
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1.the apparatus should be air tight
2.the initial level in the delivery tube should be taken after some time,so that whatever co2 is present in the flask is absorbed by KOH
2.the initial level in the delivery tube should be taken after some time,so that whatever co2 is present in the flask is absorbed by KOH
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* The connections has to be made airtight
* Use freshly prepared KOH
* Use freshly prepared KOH
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