A standard solution for Fe2 determination can be prepared from ferrous ammonium

Question

A standard solution for Fe2 determination can be prepared from ferrous ammonium sulfate (Fe(NH4)2(SO4)2.6H2O). Calculate the formula weight of ferrous ammonium sulfate. (Units = g/mol) Calculate the mass of Fe in 142 mg of ferrous ammonium sulfate. Calculate the mass of ferrous ammonium sulfate you would need to add to a 1.00 mL volumetric flask to make a solution that is 65 ppm in Fe. Stock solution A s prepared by dissolving 193 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. 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.

Explanation / Answer

1 and 2 answers were corect.

Answers

3) 0.457ppm

4) 3.9x104 ppm

5) 1.498x103 ppm

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