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Calculate the number of millilitre of NH...

Calculate the number of millilitre of `NH_3 (aq)` solution `(d=0.986 g/mL)` contain `2.5%` by mass `NH_3`, which will be required to precipitate iron as `Fe(OH)_3` in a `0.8g` sample that contains `50% Fe_2O_3`.

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