1:1 Airbag

Preparation & Assembly

A digital balance is used to weigh the mass of sodium bicarbonate (~0.5 g).

If you dispense a little more or less than 0.5 g, that is fine. Just record all decimal places displayed on the balance.

Record the mass of sodium bicarbonate in your lab notebook.

After using the balance, make sure that all spills are properly cleaned.

Using a plastic pipet, measure the amount of 6.0 M acetic acid calculated on the previous page.

Squeeze the bulb on the plastic pipet, then insert the tip of the pipet into the acetic acid solution.

Slowly let some pressure off the bulb to draw liquid into the pipet until the bottom of the meniscus is on the line for the volume you want to measure.

Demonstration of pipetting technique. The bulb of the pipette is squeezed to expel air from the pipette. The bulb is then released enough to draw liquid into the pipette until the liquid reaches a predetermined mark on the pipette. The pipette is then moved to a second beaker. Liquid in the pipette is dispensed by squeezing the pipette bulb until all liquid is expelled into the second beaker.

Add the sodium bicarbonate to the airbag and pack it into one corner.

Fold the airbag over to avoid premature mixing of the reactants.

Insert the pipet into the airbag and seal it up to the pipet bulb to drive out excess air.

Demonstration of the airbag reaction. Sodium bicarbonate is added to an empty, sealable plastic bag. Acetic acid is added while keeping the bag folded to prevent the sodium bicarbonate and acetic acid from mixing. The bag is sealed and the sodium bicarbonate and acetic acid are allowed to mix. The bag is shaken and kneaded to improve the mixing and reaction process.

Run the 1:1 airbag

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