27-1. A weighed portion of ore of mass m g was dissolved and, after appropriate treatment, Fe2 + ions were titrated with a solution of potassium permanganate using the photometric method. Construct the titration curve and calculate the mass fraction (%) of iron in the sample according to the following measurement results:
m = 1.0389 Conc KMnO4 0.1075 n
Opt. the density of the solution after adding KMnO4, V (KMnO4), ml:
10 12 14 16 18 20
0.01 0.01 0.01 0.05 0.1 0.15
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