Answer to Question #251312 in Physical Chemistry for SHANIB HUSSAIN

Question

Explain the procedure about determination of the amount of FAS solution by titrating against standard KMnO4 in acidic medium

Answer 1

By determining the exact mass of the FAS samples taken, and from the volume of KMnO4 solution required to titrate those samples, the exact molarity of the KMnO4 solutions could be calculate.

In the second week of the experiment, you titrated samples of an "unknown" iron(II) salt with the same KMnO4 solution, in order to determine what % by mass of Fe it contained. Knowing the volume of the KMnO4 solution required to reach the endpoint enables you to calculate the number of moles of iron present in each sample and the mass of iron(II) present in each sample. Then, from the mass of iron(II) in a sample and from the mass of the sample itself, you can calculate the % of Fe in the sample.