A standard solution for Fe2+ determination can be prepared from ferrous ammonium sulfate (Fe(NH4)2(SO4)2.6H2O). a) Calculate the formula weight of ferrous ammonium sulfate. (Units = g/mol) b)Calculate the mass of Fe in 141 mg of ferrous ammonium sulfate. c)Calculate the mass of ferrous ammonium sulfate you would need to add to a 4.00 mL volumetric flask to make a solution that is 39 ppm in Fe. d)Stock solution A is prepared by dissolving 181 mg of ferrous ammonium sulfate in water and diluting to volume in a 500-mL volumetric flask. Calculate the concentration of iron, in ppm, in stock solution A. e)Stock solution B is prepared by diluting 8.00 mL of stock solution A to 100.00 mL. Calculate the concentration of iron, in ppm, in stock solution B.
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