Please help me solve these two questions: A standard solution for Fe 2+ determin

Question

Please help me solve these two questions:

A standard solution for Fe2+ determination can be prepared from ferrous ammonium sulfate (Fe(NH4)2(SO4)2.6H2O).

1) Stock solution A is prepared by dissolving 165 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.

2) Stock solution B is prepared by diluting 7.00 mL of stock solution A to 100.00 mL. Calculate the concentration of iron, in ppm, in stock solution B.

Thanks!

Explanation / Answer

(1) stock solution A is prepared by dissolving 165mg of iron , made up to 500ml.

1ppm = 1mg/1l...

so, 165mg/0.5l = 330 = 330ppm

(2) stock solution B : 330 ppm * 7 /100 ( dilution formula)

so, conc in stock B = 23.1 ppm

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