Try working out the pH, the acidity.
You can try adding indicators to it, or you can try reacting coke with a reactive metal such as magnesium ribbon. Or, you could try the coin trick... :)
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Coke is an acid.
put a can of coke in when you wash the acid in the coke will take it out most of the time. Been doing it for years!
Coke in and of itself is not an acid but a mixture of a variety of substance, some of which are acids. Coke contains carbonic acid and some phosphoric acid.
Phosphorus is a chemical element, while phosphoric acid is a compound made from phosphorus. Phosphoric acid is found in some soft drinks like Coca-Cola as an additive. The "phosphorud" you saw in the ingredients list of Coke is likely a misspelling, and it should actually be "phosphoric acid."
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I'd use either coke, diet coke, or any kind of coke, because it has a lot of sugar and caffien.
What is the acid that makes Coke and Pepsi fizz?
An acid.
Phosphoric acid and carbonic acid.