- In this lab you will test for the presence of CO2 gas in exhaled breath.
MATERIALS NEEDED:
Limewater (See experiment LIMEWATER for instructions.)
Straw
Pint jar or glassPROCEDURE:
Fill the jar one-half full with limewater.
Use the straw to exhale into the limewater.
Continue to exhale into the liquid until a distinctive color is observed.RESULTS:
- The limewater turns from clear to a milky color.
- Limewater always turns milky when CO2 is mixed with it. The chemical in the limewater combines with the CO2 gas in the exhaled breath to form a white powder that is not soluble in water. The powder is called limestone. If the solution is allowed to stand for several hours, the powdery limestone will fall to the bottom of the jar.
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- The limewater turns from clear to a milky color.
CARBON DIOXIDE BREATH
INTRODUCTION: