To determine the mass percentage of an iron sample, the dissolved sample [iron exists at the start as iron(II)] was titrated with potassium permanganate (permanganate forms manganese(IV) oxide.)If 22.25 cubic cm of 0.0123 potassium permanganate, what is the mass percent of iron in the sample?

To determine the mass percentage of iron in the sample, we first need to understand the titration process and the stoichiometry involved.

In this case, we are titrating iron(II) with potassium permanganate. The balanced chemical equation for this reaction is:

5Fe2+ + MnO4- + 8H+ -> 5Fe3+ + Mn2+ + 4H2O

From the balanced equation, we can see that 5 moles of Fe2+ react with 1 mole of MnO4-. Therefore, the ratio between the moles of Fe2+ and the moles of MnO4- in the reaction is 5:1.

To calculate the number of moles of potassium permanganate used in the titration, we can use the equation:

moles of KMnO4 = volume of KMnO4 (in L) x concentration of KMnO4

Given that the volume of potassium permanganate used is 22.25 cm^3, we first convert it to liters by dividing by 1000:

volume of KMnO4 = 22.25 cm^3 / 1000 = 0.02225 L

Next, we multiply the volume of KMnO4 by its concentration of 0.0123 M to obtain the number of moles:

moles of KMnO4 = 0.02225 L x 0.0123 M = 0.000273 moles

Since the ratio of Fe2+ to KMnO4 is 5:1, the number of moles of Fe2+ used in the reaction is 5 times the number of moles of KMnO4:

moles of Fe2+ = 5 x 0.000273 = 0.001365 moles

Now, to calculate the mass percent of iron in the sample, we need to determine the mass of iron used in the reaction.

To do this, we can use the molar mass of iron (Fe), which is approximately 55.845 g/mol.

mass of Fe = moles of Fe2+ x molar mass of Fe = 0.001365 moles x 55.845 g/mol = 0.07624 grams of Fe

Finally, to determine the mass percent of iron in the sample, we divide the mass of iron by the total mass of the sample and multiply by 100:

mass percent of Fe = (mass of Fe / mass of sample) * 100

Since we don't have the mass of the sample provided in the question, we cannot calculate the exact mass percentage of iron. However, if you have the mass of the sample, you can substitute it in the equation to find the mass percentage.