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Vitamin C Clock Reaction—Effect of Concentration on Reaction Rate—Student Laboratory Kit

By: The Flinn Staff

Item #: AP7173

Price: $24.60

In Stock.

In the Vitamin C Clock Reaction Kinetics Laboratory Kit, students discover that reaction rates depend on reactant concentrations! Students won’t be “watching the clock” during lab, they’ll be performing their own clock reaction!

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Product Details

Your students won’t be “watching the clock” during this class period! They will be jumping at the chance to perform their very own clock reaction experiment using common chemicals. Students mix two colorless solutions of varying concentrations together and watch in amazement as the mixed solution suddenly flashes to blue. How long will it take for the clock to “ring”? Students discover that it depends on the concentration of the reactants! This activity provides a simple yet dramatic way to introduce the topic of reaction rates and to explore factors that affect the rate. Includes complete instructions with reproducible student handouts, valuable Teacher Notes, and all the necessary chemicals for the experiment and the recommended disposal procedure.

Complete for 30 students working in pairs. Super Value Kit is complete for 5 classes of 30 students working in pairs.


Materials Included in Kit: 
L-ascorbic acid, 3 g
Hydrogen peroxide, 3%, 473 mL
Iodine, tincture, 35 mL
Sodium thiosulfate, hypo, pentahydrate, 50 g
Starch, soluble potato, 1 g
Pipet, Beral-type, graduated, 45

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Cause and effect
Scale, proportion, and quantity
Systems and system models
Energy and matter