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|Experiment 2. The gas produced in respiration | |
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|(a) Label two boiling tubes A and B and place a known weight or number of living organisms in A. | |
|Place an equal quantity of dead or non-living material in B. | |
|Cover the mouth of each tube with a piece of aluminium foil. Press firmly into place round the rim| |
|of the tube. | |
|Leave the tubes for at least ten minutes. | |
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|(b) Use a graduated pipette or syringe to place 2 cm3 lime water in each of two clean test-tubes | |
|and label these A and B. | |
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|(c) You are provided with a syringe attached to a glass delivery tube drawn out to a fine point. | |
|Check that the syringe plunger is pushed fully down in the barrel. | |
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