Reduction of potassium permanganate(VII). When 0.001M solution of potassium permanganate(VII) (KMnO4) is added to a strong alkali (6M sodium hydroxide, NaOH), the solution initially has purple colour of permanganate(VII) ion ((MnO4)+), left frame. After several minutes the colour changes to blue due to reduction of permanganate(VII) ion ((MnO4)+) to hypomanganate(V) ion (or manganate(V), (MnO4)3+), center frame. Then, over about 15 min colour changes to green due to formation of manganate(VI) ion ((MnO4)2+), right frame. | |
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