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Stomach Soft acid drinks Vinegar Tomatoes Milk Seawater Detergent Household Oven ammonia cleaner Battery acid Lemon juice Coffee Pure water Blood Antacid As the scale shows, a solution with a pH lower than 7 is described as acidic. The lower the value, the more acidic the solution. A solution with a pH greater than 7 is basic. The higher the pH is, the more basic the solution. A solution with a pH of exactly 7 has equal concentrations of H,O ions and OH" ions. This solution is neutral. Pure water at 25C has a pH of 7. One way to determine pH is by using universal indicator paper. This paper changes color in the presence of H,O* ions and OH" ions in solution. The color of the pH paper indicates the pH, with different colors corresponding to different pH values. Another way to determine the pH of a solution is by immersing the electrodes of a pH meter in the solution and reading the display. Small, battery-operated pH meters are convenient for testing the pH of soils and streams. Milk of magnesia TIP Each number O on the pH scale represents a ten- fold change in H' concentration. For example, seawater is 100 (10 x 10 or 10) times more acidic than detergent. 4, Interpret Graphics What is the pH of stomach acid? What is the pH of coffee? How many times more acidic is stomach acid