BIOLOGY PRACTICAL RESPIRATION QUESTION WITH ANSWERS PDF
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This section contains the following:
_ Limewater
_ Apparatus
_ Sample respiration practical with solutions
(1) Limewater
Limewater is a saturated solution of calcium hydroxide. It is used to test for carbon dioxide.
When carbon dioxide is bubbled through limewater, the solution becomes cloudy. This is due to the precipitation of calcium carbonate by the reaction:
CO2(g) + Ca(OH)2(aq) → CaCO3(s)
Limewater can be prepared from either calcium hydroxide or calcium oxide.
Calcium oxide reacts with water to form calcium hydroxide, so either way you end up with a calcium hydroxide solution.
Calcium oxide is the primary component in cement. Calcium hydroxide is available from building supply shops as chokaa.
(2) Apparatus
Many books call for delivery tubes, test tubes, and stoppers. These are totally unnecessary.
Add the limewater to any small clear container and blow into it with a straw.
BIOLOGY PRACTICAL RESPIRATION QUESTION WITH ANSWERS PDF