Respiration p. 75


PROCEDURE p. 76

Prepare the standard and experimental flasks:

Add a few drops of 0.5% NaOH to make the solution slightly basic with a medium pink color.

Divide the original flask equally into two, then use one as the standard and the other as experimental.
This will ensure that the 2 solutions are exactly the same.

Exhale into flask for 1 minute; do not stopper the flask too tight: let some air escape!
Then add 0.5% NaOH until solution returns to standard color.

NOTE: wear goggles; exhale only, do not inhale (drink)!

Repeat procedure with moderate and strenuous physical activity, 3 trials each. p. 77


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