An iron supplement tablet labeled to contain 70 mg of iron was dissolved in exac

Question

An iron supplement tablet labeled to contain 70 mg of iron was dissolved in exactly 100.0 mL of H_2O. What volume of this solution is needed to give a 0.020 mg/mL Fe solution when diluted to 100 mL. Exactly 3.00 mL of the tablet solution in #1 was diluted to 100.0 mL. 10.00 mL of this solution was treated with the appropriate reagents to form Fe(Phen)3 and diluted to 100.0 mL. The concentration of Fe of this solution was found to be 0.0022 mg/mL. Calculate the total mg of Fe per tablet. Calculate the % relative error in the experimental value for the mg of Fe/tablet compared to the labeled value.

Explanation / Answer

100 mL of water contain 70 mg iron

1.0 mL of water will contains = 70/100 = 0.7 mg/ mL

Now again dilited with 100 mL of water then concentration becomes 0.007 mg/ mL

0.007 mg present in 1 mL

0.020 mg will present 1 mL /0.007 mg*0.02 mg= 2.86 mL

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