Manganous sulfate (MnSO4) and a mixture of potassium hydroxide and potassium iodide (KOH and KI) are added to a water sample. If there is no oxygen present, the MnSO4 will react with the KOH to form a white precipitate, manganous hydroxide (Mn(OH)2). If oxygen is present, the Mn(OH)2 will react further to form a brown precipitate, manganic oxide (MnO(OH)2):
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