| Acidic agents | Ingredients | pH value |
| Coke (Coca Cola, The Coca Cola Company, New York, USA) | Carnonated water, high fructose corn syrup, caramel color, phosphoric acid, natural flavors, caffeine | 3.63 |
| Orange juice (Icim orange juice, Ulker, Sakarya, Turkey) | Water, orange juice concentrate, fructose-glucose syrup, sugar, antioxidant (ascorbic acid) | 4.53 |
| Lemonade (Camlica, Ulker, Usküdar, Turkey) | Water, lemon juice concentrate sugar, fructose-glucose syrup, antioxidant (ascorbic acid), citric acid, | 4.07 |
| Black-carriot juice (Doganay, Adana, Turkey) | Water, black carriot, salt, boiled and pounded wheat, turnip, chili papper, preservative (sodium benzoate) | 3.89 |
| Mineral water (Kizilcahamam, Ankara, Turkey) | Different cations and anions | 5.88 |