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Now we can collect the carbon dioxide we made in project # "Making Carbon Dioxide". There are several ways to do it, depending on what we want to do with the gas once we have it.

a. As soon as some carbon dioxide is produced in a soda pop bottle or flask, pull the neck of a balloon over the mouth of the balloon. The balloon will inflate. When it is filled, tie off the neck. You now have a quantity of carbon dioxide gas in the balloon.

b. Produce carbon dioxide in a flask, and collect it by placing a one-hole stopper tightly in the flask. Insert a short glass tube into the flask. Attach a piece of rubber tubing to the other end of the glass tube.

[The tubing should be 18 inches or so in length (long enough so that it can be placed under inverted test tubes or bottles).]

Now put about 2 inches of water in a low pan or dish. Fill two test tubes or bottles with water and invert them in the dish. Place the free end of the rubber tubing in one of the test tubes or bottles. You will see the carbon dioxide as it bubbles through the water.

c. Seal pieces of dry ice or vinegar added to baking soda, eggshells, or limestone in plastic sandwich bags. The bags can be sealed with a rubber band. As carbon dioxide is given off by the mixture, the bags will inflate.

d. Place an Alka Seltzer tablet in the bottom of a balloon or plastic sandwich bag. Tie the encased tablet tightly with a rubber band or string, then fill the remainder of the balloon or bag with water and seal it with another rubber band or a piece of string. Carbon dioxide gas can be produced by loosening the rubber band or string around the tablet and allowing the water to reach the tablet.

These methods of collecting carbon dioxide tell us how to collect it after we have made it, but we still don't know what to do with it! This project is fun, even though we don't know how actually to use carbon dioxide.

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