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calculate molarity of the standardized potassium permanganate solution in redox titration of iron 2 into iron 3. molecular weight of hydrated ferrous ammonium sulfate is 392.14 g/mol. also use the ration of iron 2 to permanganate ion from equation: 5Fe + Mn04 + 8H gives 5Fe + Mn + 4H2O. VOLUME OF KMnO4 used in titration is 7.65 ml and mass of hydrated ferrous ammonium sulfate is 0.2911 g.

Question

calculate molarity of the standardized potassium permanganate solution in redox titration of iron 2 into iron 3. molecular weight of hydrated ferrous ammonium sulfate is 392.14 g/mol. also use the ration of iron 2 to permanganate ion from equation: 5Fe + Mn04 + 8H gives 5Fe + Mn + 4H2O. VOLUME OF KMnO4 used in titration is 7.65 ml and mass of hydrated ferrous ammonium sulfate is 0.2911 g.

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Solution

To calculate the molarity of the standardized potassium permanganate solution in the redox titration of iron (II) to iron (III), we need to follow these steps:

  1. Calculate the moles of Fe2+ in the sample: The molar mass of hydrated ferrous ammonium sulfate is 392.14 g/mol. So, the moles of Fe2+ in the sample can be calculated as follows: Moles of Fe2+ = mass of sample / molar mass = 0.2911 g / 392.14 g/mol = 0.000742 mol

  2. Determine the stoichiometric ratio of Fe2+ to MnO4- from the balanced chemical equation: The balanced chemical equation is 5Fe2+ + MnO4- + 8H+ → 5Fe3+ + Mn2+ + 4H2O. From this equation, we can see that the stoichiometric ratio of Fe2+ to MnO4- is 5:1.

  3. Calculate the moles of MnO4- used in the titration: Since the stoichiometric ratio of Fe2+ to MnO4- is 5:1, the moles of MnO4- used in the titration is 1/5 of the moles of Fe2+. Moles of MnO4- = moles of Fe2+ / 5 = 0.000742 mol / 5 = 0.0001484 mol

  4. Calculate the molarity of the KMnO4 solution: Molarity (M) is defined as the number of moles of solute per liter of solution. The volume of KMnO4 used in the titration is 7.65 mL, which is equal to 0.00765 L. So, the molarity of the KMnO4 solution can be calculated as follows: Molarity of KMnO4 = moles of MnO4- / volume of solution in L = 0.0001484 mol / 0.00765 L = 0.0194 M

So, the molarity of the standardized potassium permanganate solution in the redox titration of iron (II) to iron (III) is 0.0194 M.

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