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A drop of such a solution, corresponding to about one-twentieth cubic centimeter, or 0.0001 gramme Mn, is sufficient to give a perceptible reddish color to 200 cubic centimeters of water. As what takes place in the titration of iron with chameleon is indicated by the following formula, 10FeO + 2KMnO = 5Fe O + K O + 2MnO ,
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