Ferrous sulphate heptahydrate is used to fortify foods with iron.The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat (Rounded-off to the nearest integer) is
[Atomic weight : Fe=55.85 S=32.00 O=16.00]
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Solution
10ppm=Mass of Fe(in g)100×1000×106 Mass of Fe=1g Molar mass of FeSO4.7H2O=278gmol−1
Mass of Fe is 56 g in 1 mol
i.e. 1g in 156mol.
The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat ⇒156×278=4.96g≈5g