Purpose: To compare the amount of Carbon Dioxide (CO2) in four
different sources of gases. (Enough for each team of two or four
students) 5 vials or test tubes A graduated cylinder A funnel
straw A marble-size piece of modeling clay 4 different colored
balloons A narrow-necked bottle (the neck should be narrow
enough for a balloon to fit over it) A dropping bottle of
bromthymol blue indicator solution A dropping bottle of dilute
household ammonia (1 part ammonia to 50 parts distilled water)
100 mL vinegar 5 mL baking soda Safety goggles for wear at all
times Teacher's Lab Notes: The students will be filling balloons
with pure carbon dioxide, exhaled air, and ambient air. For
safety reasons, you should fill the balloons with automobile
exhaust. You should wear thick gloves to protect your hands from
being burned. Fill the balloons in an open area and when a
slight breeze is blowing to keep the exhaust gases away from
your face. Place a balloon over the narrow end of a metal funnel
and place the wide end of the