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Hydrogen Peroxide, Catalytic Decomposition, 2 of 2

Hydrogen Peroxide, Catalytic Decomposition, 2 of 2

C039/1297

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Credit

TURTLE ROCK SCIENTIFIC / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE PHOTO LIBRARY

Caption

Catalytic decomposition of hydrogen peroxide, 2 of 2. A 30% hydrogen peroxide solution (H2O2) undergoes a very slow decomposition into water (H2O) and oxygen gas (O2) under normal conditions. The rate of decomposition is greatly increased by addition of powdered solid potassium iodide (KI) which acts as a catalyst. The decomposition of hydrogen peroxide occurs in two steps: H2O2 (aq) + I- (aq) -> H2O(l) + OI-(aq) and H2O2(aq) + OI-(aq) -> H2O(l) + O2(g) + I-(aq).

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