They certainly are acidic! Lots of acids are perfectly safe though – citric acid is often used to make things more sour, for example, but it’s pretty harmless in small amounts. And tasty!
When carbon dioxide (which is what puts the fizz in fizzy drinks) is dissolved in water it makes an acidic solution (only mildly – nothing to panic about). Other things in fizzy drinks like (as Mike said) citric acid can contribute to this too.
Have you ever tried putting a dirty copper coin in a glass of coke? Cleans the coin a treat! (Don’t drink the coke afterwards!)
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