A dietary iron supplement consist of tablets containing the metal in the form of ferrous ions (Fe2+). The metal content of these tablets can be determined by dissolving a weighed amount of tablet(s) in dilute sulphuric acid solution and titrating an aliquot of this solution with a standard potassium permanganate solution as follows: One of the tablets is finely ground and the resulting powder has a mass of 0.4500 g. Distilled water and some sulphuric acid is added until the sample is dissolved. This solution is transferred to a 250.00 mL volumetric flask and made up to the mark. A 25.00 mL portion of this solution is pipetted into a conical flask, and titrated with a 0.0200 M KMnO4 solution. The endpoint of the titration is determined when the colourless solution in the conical flask turns a bright pink due to the presence of excess permanganate ions. The average titration value is 6.23 mL of the KMnO4 solution. The reaction stoichiometry is as follows: 2KMno4(aq)+ 8H2SO4(aq)+ 10FeSO4(aq)---> K2SO4(aq) + 2MnSO4(aq) +8H2O(l)+ 5Fe2(SO4)3(aq) Determine the percentage of iron in the tablet.
A dietary iron supplement consist of tablets containing the metal in the form of ferrous ions (Fe2+). The metal content of these tablets can be determined by dissolving a weighed amount of tablet(s) in dilute
sulphuric acid solution and titrating an aliquot of this solution with a standard potassium permanganate solution as follows:
One of the tablets is finely ground and the resulting powder has a mass of 0.4500 g.
Distilled water and some sulphuric acid is added until the sample is dissolved. This solution is transferred to a 250.00 mL volumetric flask and made up to the mark.
A 25.00 mL portion of this solution is pipetted into a conical flask, and titrated with a 0.0200 M KMnO4
solution.
The endpoint of the titration is determined when the colourless solution in the conical flask turns a
bright pink due to the presence of excess permanganate ions.
The average titration value is 6.23 mL of the KMnO4 solution.
The reaction stoichiometry is as follows:
2KMno4(aq)+ 8H2SO4(aq)+ 10FeSO4(aq)---> K2SO4(aq) + 2MnSO4(aq) +8H2O(l)+ 5Fe2(SO4)3(aq)
Determine the percentage of iron in the tablet.
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