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A lower pH level indicates that a substance is more acidic. The reason Coca-Cola is more acidic than lemonade is because the carbonic acid, the stuff that makes cola fizzy, is stronger in acidity and greater in quantity in cola than the citric acid in lemonade. Because of this, flat soda is much less acidic.

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Q: Why is the pH of Coca-Cola less than that of lemonade?
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