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Iodine Clock Reaction—Chemical Demonstration Kit

By: The Flinn Staff

Item #: AP4601 

Price: $58.51

This item is temporarily out of stock. The expected available to ship date is 06/07/2024

The Iodine Clock Reaction Kinetics Chemistry Demonstration Kit allows for a quantitative demonstrate of the popular iodine-starch clock reaction. Mix two colorless solutions and watch as they suddenly change from colorless to dark blue.

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This item can only be shipped to schools, museums and science centers

Product Details

Mix two colorless solutions and watch as, after a few seconds, they suddenly change from colorless to dark blue. What an attention-getter! This kit allows you to quantitatively demonstrate the popular iodine-starch clock reaction. In each demonstration, the class records six sets of data comparing the effects of concentration, temperature and a catalyst on the measured rate. Students become actively involved by counting the number of seconds from the initial mixing of the solutions to the appearance of the blue color. Explore concepts of kinetics with this dramatic, engaging demonstration! Teacher Demonstration Notes included.

Concepts: Kinetics, catalysts, clock reactions.
Time Required: 25 minutes


Materials Included in Kit: 
Potassium iodate solution, 0.2 M, 800 mL, 3
Sodium meta-bisulfite, 16 g
Starch, soluble, potato, 26 g
Sulfuric acid solution, 0.1 M, 70 mL

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Analyzing and interpreting data
Using mathematics and computational thinking
Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
MS-PS3.A: Definitions of Energy
HS-PS1.B: Chemical Reactions
HS-PS3.A: Definitions of Energy
HS-PS3.B: Conservation of Energy and Energy Transfer
HS-PS3.D: Energy in Chemical Processes

Crosscutting Concepts

Energy and matter

Performance Expectations

MS-PS1-4. Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed.
HS-PS3-3. Design, build, and refine a device that works within given constraints to convert one form of energy into another form of energy.
HS-PS1-5. Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.