Q. 245.0( 2 Votes )

The following experiment was set-up to show that a gas is given out during respiration. But there was no rise in the level of water. Why did it happen?

Answer :

The KOH (potassium hydroxide) test tube placed within the conical flask absorbs the moisture, oxygen, O2 in the flask and released CO2 due to which the level of water rises in the tube due to partial vacuum created by absorbed CO2. An equal volume of water rises. But here, there was no rise in the level of water maybe because of experimental errors like the cork might not have been properly air-tight or maybe the KOH prepared was not fresh or maybe the germinating seeds were not kept moist etc.

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