arbon dioxide
plastic bottle
some freshly pre
Active
to show that we exhale carbo
kre a clean and transparent pl.
narrow opening. Pour son
ter in it. Make a hole in
eart a plastic straw in it. Fix
hottle and make it airtight. Mal
end of straw dips in limewa
through the straw into limewat
dobserve the change in its col
limewater in it. Make
in the cork
Fix the cork in
Make sure that
bewater. Blow
water several time
in its colour.
Observation and inference
Limewater turns milky in the bottle. Why?
Carbon dioxide turns limewater milky. It mes
exhaled air contains carbon dioxide.
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