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What weight of limonite should be taken so that after solution in HCl and reduction of...

What weight of limonite should be taken so that after solution in HCl and reduction of the iron, the volume of
standard ceric solution required for titration will be one half the percentage of Fe2O3 in the sample (6.000
mL of the ceric solution = 2.000 mL KHC2O4 solution = 3.000 ml of 0.08000 N NaOH)?

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