Record the color of the indicator, the number of toothpick scoops of citric acid added, and the pH number in the chart for well 3. Continue adding toothpicks of citric acid and testing the solution in ...

The normal pH range for saliva is 6.2 to 7.6. If your saliva’s pH level drops below 5.5 (such as when you’re drinking acidic beverages), the acids start to break down your tooth enamel. When ...

Stomach acid is a highly acidic liquid your body produces to help you digest and absorb nutrients in food. Learn what happens when it is too strong or too weak.