Investigate Effect of PH on Enzyme Activity Using Potato Extract and Hydrogen Peroxide. Measure Reaction Time at Different PH Levels.

Title: Investigating the Effect of pH on Enzyme Activity

Objective: To determine the effect of pH on the activity of the enzyme catalase.

Materials:

1. Fresh potato slices
2. Hydrogen peroxide solution (3%)
3. Buffer solutions of different pH levels (pH 3, 5, 7, 9, and 11)
4. Test tubes
5. Graduated cylinder
6. Stopwatch
7. Mortar and pestle
8. Filter paper
9. Forceps
10. Distilled water
11. pH meter or pH indicator paper
12. Safety goggles
13. Lab coat
14. Gloves

Procedure:

1. Put on safety goggles, lab coat, and gloves to ensure safety during the experiment.
2. Prepare the buffer solutions of different pH levels (pH 3, 5, 7, 9, and 11) using the appropriate chemicals and distilled water. Use a pH meter or pH indicator paper to verify the pH of each solution.
3. Cut fresh potato slices into small pieces and grind them using a mortar and pestle to obtain a homogenous potato extract.
4. Transfer the potato extract to a beaker and add distilled water to make a 10% potato extract solution.
5. Label five test tubes as pH 3, pH 5, pH 7, pH 9, and pH 11.
6. Using a graduated cylinder, add 5 mL of hydrogen peroxide solution to each test tube.
7. Add 5 mL of the corresponding buffer solution to each test tube, ensuring the pH levels match.
8. Place the test tubes in a water bath at a constant temperature of 37°C for 5 minutes to allow the solutions to reach the desired temperature.
9. After 5 minutes, add 5 mL of the 10% potato extract solution to each test tube using a dropper or pipette.
10. Start the stopwatch and record the time it takes for each test tube to produce a visible reaction (e.g., bubbling or foaming).
11. Repeat steps 6-10 three times for each pH level to ensure accuracy and reliability of the results.
12. Calculate the average time taken for each pH level and record the data in a table.
13. Plot a graph with pH levels on the x-axis and average reaction time on the y-axis.
14. Analyze the graph to determine the effect of pH on enzyme activity.

Note: Ensure proper disposal of all materials used in the experiment and follow safety guidelines throughout the investigation.