pH Lab Student Data Sheet Name: ______
pH Question A Data Table:
Solution / Prediction / pH Color / Actual pHpH Question B Data Table:
Solution / Prediction / pH Color / Actual pHpH Lab – Student Data Analysis
1. What is pH?
2. Draw one pH scale below. Arrange the solutions from both exercises on a pH scale in order of increasing pH, noting the pH of each substance.
0 7 14
3. It is often recommended that aspirin be taken with a large glass of milk or water. Based on your results in these lab exercises, explain why this is a good recommendation?
4. Would apple or orange juice be a good accompaniment to aspirin? Why or why not?
5. Which of the medicines you tested are often used for the treatment of "acid indigestion" (too much acid in the stomach)? Based on your results, how would you explain the action of these medicines?
6. Enzymes function best at particular pH values. In the normal human stomach, a pH of 2.0-3.0 provides the environment required for the proper functioning of the digestive enzymes found there. What effect would the medicines that are basic have on these enzymes ability to digest (break down) food?
7. In some plants, soil pH affects the uptake of certain metals that can complex (join) with a pigment in the flower and prevent its normal color expression. For instance, in hydrangeas, higher pH values prevent the uptake of aluminum and the flowers appear pink whereas at lower pH values the flowers appear blue. Let’s say you have a pink hydrangea plant.
Is the soil more acidic or basic in this situation?
Explain at least two ways to make the hydrangeas turn blue.