Iodine Clock Reaction

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

Hypothesis

I think the increased concentration of Potassium Iodide, increase in Temperature, and 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

Reactants before the reaction

• Stopwatch

• Hot Plate

• Ice

• Safety RegulationsSafety Glasses

• Apron

• Safety Gloves

Procedure

Reactants after the reaction

Part 1

• Label six beakers 1A,2A,3A,4A,5A,6A

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

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

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

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

Part 2

• Label six beakers 1B,2B,3B,4B,5B,6B

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

Part 3

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

• Repeat Step 1 for beakers 2-6

Data

Control | Dif.Concentration | Dif. Temperatures| Catalyst

The video of the experiment: