PROCEDURE p. 76
NOTE: Instead of preparing a second experimental flask, 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.
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.
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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