Question

Orange juice is a solution that contains citric acid, which gives orange juice an approximate pH of 3.5. Which substance is more acidic than orange juice?

Answer 1

Coca-cola (pH ≈ 2,5-3,0)
Vinegar (pH ≈ 3,0)

Answer 2

more acidic means lower pH. So choose the answer that has a lower pH than 3.5.