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Elephant Toothpaste Demo Calculator - Online Reaction Ratios

Calculator Educational chemistry demo elephant toothpaste ratio
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Elephant Toothpaste Demo Calculator

Calculate reaction ratios for the classic elephant toothpaste experiment. Determine catalyst amount, oxygen yield, and foam volume.

Reaction Parameters
Results
Theoretical O2 Yield
--
liters (at STP)
Recommended Catalyst
--
grams
Estimated Foam Volume
--
liters (range)

Results are theoretical approximations. Actual foam volume depends on detergent type, vessel shape, and reaction temperature.

Reaction Details & FAQ
Chemical Equation

2 H2O2 → 2 H2O + O2

The decomposition of hydrogen peroxide is catalyzed by iodide ions (from KI) or by the enzyme catalase (present in yeast). The rapid release of oxygen gas creates foam when mixed with liquid soap.

Concentrated hydrogen peroxide (>6%) is corrosive and can cause skin burns. Always wear proper protective equipment and keep away from children. The reaction is exothermic; the foam may be hot.

Yes, 3% works but produces less vigorous foam. Use more volume and yeast as catalyst for a family-friendly version. Expect a slower, smaller foam fountain.

The recommendation is based on typical ratios used in demonstrations: ~0.35 g KI per gram of H2O2, or ~0.25 g yeast per gram H2O2. You can adjust slightly to control reaction speed.

Potassium iodide produces a more dramatic and faster reaction, especially with higher concentrations. Yeast is safer and easier to obtain for home use but produces a slower reaction that can be less spectacular.

Use a narrow-neck vessel, add more dish soap, or increase the concentration of hydrogen peroxide. Also, catalyst amount can be slightly increased to accelerate oxygen release.
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