http://www.wisegeek.com/what-is-a-carbonated-beverage.htm
Overview of Soft Drinks:
"Soft drinks are carbonated water, flavoured and sweetened with either sugar or sweetener."
Carbonation (charging with carbon dioxide gas) of the drinks are what creates the bubbles and fizziness in taste.
"Acids such as citric and phosphoric acids, add a refreshing tartness or bite and help preserve the quality of a soft drink."
This could possibly be another factor to the fizziness in soft drinks.
Experiment ideas:
-"Coke and Mentos" (measure the amount of liquid lost when Mentos is placed in a drink)
-Observation of bubble loss (too many bubbles to count!)
-Taste tests (unreliable as it may be influenced by opinions)
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