138. Solving a chemistry problem
82. A weighed amount of hematite containing 69.96% iron is equal to 0.5000 g. After dissolving it in acids, the resulting solution is diluted in a 250 ml volumetric flask. What is the volume of КМnО4 with С (1 / 5КМnO4) = 0.1215 mol / dm3. required for titration of iron ions, reduced to Fe 2 + in advance, in 100 cm3 of solution?
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