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Old 12-22-2005, 03:14 AM
Cardinal Cardinal is offline
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I assumed it was the carbonic acid that comes from the carbonation. A chem teacher I worked with pointed out that in the real world, even pure water has a slightly acid pH because of the dissolved CO2 in it. If you force the CO2 in, you get high levels of bitter/tangy acid. That's what makes the soda water so yucky when the soda syrup runs out a the McDonald's. It's also why sodas need so much sweetner. You need it to counterbalance the acid.