H2O2 reduces KMnO4, 4 of 5. Potassium permanganate (KMnO4) is a strong oxidizing agent and is reduced when it reacts. In this sequence a 3% solution of hydrogen peroxide (H2O2) in a pipette is added to a beaker containing potassium permanganate solution (circa 103M). First violet Mn7+ is reduced to brown Mn4+ (MnO2). As more hydrogen peroxide is added, Mn4+ is reduced further to nearly colourless Mn2+. Some oxygen bubbles (O2) are also produced as a result of MnO2 acting as a catalyst for H2O2 decomposition. | |
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Crédit: | Science Photo Library / Giphotostock |
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