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Mistakes of this sort are easily made and constitute one of the most frequent sources of error. 5Na C O + 2KMnO + 8H SO > 5Na SO + 10CO + K SO + 2MnSO + 8H O.
Deduct this volume from the amount of permanganate solution used in the titration. From the data obtained, calculate the relation of the permanganate solution to the normal. The reaction involved is: 5Na C O + 2KMnO + 8H SO > 5Na SO + K SO + 2MnSO + 10CO + 8H O !Method A!
This reaction proceeds according to the formula, 3MnCO + 2KMnO + H O = 2KHCO + 5MnO + CO and it may be employed for estimating the content of manganese by titration.
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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