I am doing a chemistry lab report on figuring out the volume of air trapped inside a bottle. Here is the procedure:
- Fill a larger container or tub about half full with tap water
- Fill a 2 L plastic soft drink bottle with tap water. Put the cap on loosely
- Carefully turn the bottle upside down without spilling any water
- Put the bottle into the large container of water so that the mouth of the bottle is underwater. Remove the cap underwater
- Feed the flexible tubing under the water so that one end goes inside the bottle
- Put your straw into the other end of the tubing. Do not share straws
- When it is your turn, exhale into the straw to collect the air of one normal breath
- With a marking pen, mark the volume of air on the soft drink bottle
- Figure out the volume of the air trapped inside the bottle. Record this volume
How might I do number 9? My proposed procedure is:
- With a marking pen, mark the new volume of air on the soft drink bottle
- Record this volume, which will be smaller than the volume found in step 8 as some of the water will have been displaced by the breath
- Subtract the new volume of air from the old volume of air to find the volume of the air trapped inside the bottle
- Record this volume
Thanks!