Pepsi contains Carbonic Acid(H2CO3), and water and many other natural coloured artificial matters
However, Pepsi is a mixture, thus it does not have any definite formula. However, it contains very weak Carbonic Acid, which can react with other bases to form Carbonate salts.
H2CO3 + 2NaHCO3 = Na2CO3 + 2CO2 + 2H2O
(Carbonic Acid reacts with Baking Soda, which contains aminly Sodium Bi-Carbonate, to form Sodium Carbonate along with Carbon-Di-Oxide and Water)
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