(Partner: Victoria L.)
Procedure:
1) Put on safety goggles.
2) Put 3g NaHCO3 (baking soda) in the balloon.
3) Add 70ml HC2H8O2 (vinegar) to the Erlenmeyer flask.
4) Place the balloon over the top of the flask letting the baking soda drop into the flask.
5) When the reaction is complete, and the balloon stops inflating, take the string and tie off the balloon.
6) Place balloon in a beaker filled with 600ml of water until it is fully submerged. (new level: 1300ml water)
7) The actual volume of the balloon is calculated by subtracting first water level from the second water level.
Analysis:
1)
2-4)
5) The balloon may not have been completely tied off, which would cause the volume to be lower. The first time we put the balloon in the water, the water level was too high and it overflowed out of the beaker.
6) We made the amount of water in the beaker lower and tied off the balloon tighter to secure all of the CO2 inside.
The biggest source of error in your lab is determining the volume of the balloon. Not only is the beaker extremely inaccurate, but you change the volume by pressing down on the balloon to keep it under the water. We are measuring the balloon at atmospheric pressure, but pressing on the balloon alters that so volume is not correct.
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