Iodine Clock Reaction

Reactants Products

Question

How does concentration, temperature, and a catalyst effect the rate of the of the iodine clock reaction?

Hypothesis

Increased concentration of Potassium Iodate will increase the reaction rate.

Increased temperature will increase the reaction rate.

The addition of a catalyst will increase the reaction rate.

Materials

• 65mL 0.2M Potassium Iodate (KIO3)

• 12mL 0.2M Sodium meta-Bisulfate (Na2S2O5)

• 36mL 2% Starch Solution

• 2mL 0.1M Sulfuric Acid (H2SO4)

• 221mL Distilled Water

• 12 Beakers 100mL+

• 2X 10mL Graduated Cylinder

• 2X 50mL Graduated Cylinder

• 2X 100mL Graduated Cylinder

• Thermometer

• Stopwatch

• Hot Plate

• Ice

Procedures

Part I

1. Label six beakers 1A,2A,3A,4A,5A,6A

2. Pour 10mL of Potassium Iodate and 30mL of distilled water into 1A,4A,& 5A

3. Pour 20mL of Potassium Iodate and 20mL of distilled water into 2A

4. Pour 5mL of Potassium Iodate and 35mL of distilled water into 3A

5. Pour 10mL of Potassium Iodate, 32mL of distilled water, and 2mL of Sulfuric Acid into 6A

Part II

1. Label six beakers 1B,2B,3B,4B,5B,6B

2. Pour 2mL of Sodium meta-Bisulfate, 30mL of the 2% starch solution (98% distilled water), and 40mL of distilled water into each beaker

Part III

1. Pour the contents of 1A into 1B and record the time it takes for the solution to change colors

2. Repeat Step 1 for beakers 2-6

Data

Control | Dif. Concentration | Dif. Temperatures | Catalyst

The video demonstrating the reaction :

Conclusion

The hypothesis was correct. Higher concentration, higher temperature, and the addition of a catalyst increase the rate of the reaction.