Aspirin absorption in carbohydrate solutions
The materials required for the science fair project:
- 3 transparent cups
- 3 aspirin tablets
- pH paper
- 1 stopwatch
- 1 bottle of water
- 1 teaspoon
- 1 packet of sugar
- 1 packet of corn flour
1. For this science fair project, the independent variable is the solution in the cups - water, sugar water and water mixed with corn flour. The dependent variable is the pH of the solution in the cups. This is determined by checking the pH of the solution in the cups every minute for 5 minutes. The constants (control variables) are the size of the cups, the amount of water in the cups, the amount of carbohydrates added, the duration of the testing and the temperature of the environment, which will remain at room temperature.
2. Fill the 3 cups with bottled water. The 1st cup will be the control and will contain only water. Add one teaspoon of sugar to the 2nd cup and let it dissolve in the water. Add one teaspoon of corn flour to the 3rd cup and mix it into the water. Measure and record the initial pH of the solutions in the 3 cups in a table, as shown below.
3. Drop one tablet of aspirin in the 1st cup. As the aspirin dissolves in the water, the acetylsalicylic acid will make the mixture in the cup acidic and lower the pH of the solution. Check the pH of the solution in the cup every minute for the next 5 minutes. Record all the readings in a table, as shown below.
4. Repeat step 3 on the cups with sugar and corn flour added. Record the pH measurements in a table, as shown below.