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2. +. Fe, H. Mn, 2. Fe, and 3. +. , 4 H 2 O D'o` u : 5 n permanganate = n fer total 5 C× V 0 = n fer total O` u C et V 0 sont respectivement la concentration et le volumè a ´ equivalence du permanganate, et n permanganate et n fer total sont le nombre de moles de permanganate et de fer total dans le sel Mohr

. Au-dernier-moment, doser d'abord l'´ etape 1, puis l'´ etape 2. Cette précaution permet de s'affranchir de l'incertitude sur l'´ evolution de la concentration en Fe