Given: For Part C, What is mass of Iron in the sample and the percent of iron in

Question

Given:

For Part C, What is mass of Iron in the sample and the percent of iron in the sample?

Preparation of H2C2O4 Solution Mass of H2C2O4 2 H2O Volume of solution KMnO4 Standardization Trial Volume of H2C2O4 KMnO4 Initial buret reading Final bures reading UNKNOWN NUMBER: Trial Mass of unknown KMnO4 Initial buret reading Final buret reading Preparation of H2C2O4 Solution Mass of H2C2O4 2 H2O Volume of solution KMnO4 Standardization Trial Volume of H2C2O4 KMnO4 Initial buret reading Final buret reading UNKNOWN NUMBER: Trial Mass of unknown KMnO4 Initial buret reading Final buret reading

Explanation / Answer

5 Fe{2+} + KMnO4 + 8 H{+} ? Mn{2+} + 5 Fe{3+} + K{+} + 4 H2O

for trial 1
(0.01039 L KMnO4) x (0.025 mol/L) x (5 mol Fe / 1 mol KMnO4) x (55.8452 g Fe/mol) = 0.0725 g Fe

(0.0725 g / (0.402 g) = 0.18 = 18% Fe

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