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|Dr. Skip's Corner: K-12 Teaching Adventures @ OSU Engineering|
THE FIZZ FACTOR – WHICH SODA HAS THE MOST POP?
Dr. Skip Rochefort
I’m sure we’ve all experienced the fizz factor at some points in our lives, whether it be opening a soda can and having it spill out all over the table (not fun) or purposely shaking-up a soda and spraying a friend (FUN!). We probably all have our own personal ideas on which sodas make the most fizz….and so do the kids! There are various ways to figure this out.
Experiment #1: Visual Product Testing (Qualitative)
Experiment #2: Balloon Expansion (Quantitative?)
Volume Displacement – The FIZZ FACTOR!
Volume of gas released = initial height (volume) – final height (volume)
You can see that there is pretty good reproducibility (with a few exceptions) between runs for the same group and even between groups. When we look at the rankings, they both come out with the surprising result (at least for me it was a surprise!), that the “clear sodas” such as Sprite and Sierra Mist have more fizz (CO2 gas) than the colas….and root beer is about the lowest in fizz factor. This experiment also lends itself nicely to making plots of the data (bar graphs are nice) and for the more advanced grades, discussing standard deviations and error in measurements.
Powering a Car with Soda
Which soda would you choose as your fuel?
Kitchen Chemistry: Stoichiometry, Gas, and the Reaction Powered Car
The goal is to introduce the scheme of powering a small car with a chemical reaction, by first understanding how much gas is produced by a reaction. During this lab we’ll also explore the concept of stoichiometry and limiting reagents in a reaction.
Background – Kitchen Chemistry: The Baking Soda and Vinegar Reaction
The above equations are all representations of the same reaction. It is important to note that for a complete reaction the molar ratio of acetic acid to sodium bicarbonate must be kept constant. Baking soda is 100% sodium bicarbonate, but vinegar is only 5% (by volume) acetic acid.
The carbon dioxide produced can be used to power a small car. Before we can use this reaction to power a car, we need to find out how much carbon dioxide is produced.
Additional Experimental step after you have gone through various amounts of baking soda.
Real Engineering -- Design, Build and Run a Reaction Powered Car
Car – build using the K’Nex kit provided.
Reaction Vessel – see instructor for a choice of reaction vessels.