12. Solving a chemistry problem
2. For analysis, 20.0 cm3 of waste water containing iron compounds was taken, oxidized from to Fe3 and precipitated in the form of hydroxide. The washed precipitate was dissolved in HCl and titrated with 4.05 cm3 of a 0.0505 mol/dm3 solution of complexone III. Calculate the concentration of iron (mg/cm3) in the waste water.
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