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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!
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