Question

13) The amount of iron in a meteorite was determined by a redox titration using KMnO4 as the titrant. A 0.723 g sample was dissolved in acid, and the liberated Fe3+ quantitatively reduced to Fe2+. Titrating with 0.028 M KMnO4 requires 44.71 mL to reach the endpoint. Unbalanced reaction: Fe2+ + MnO4- -> Fe3+ + Mn2+. Determine the % w/w Fe2O3. Report your answer to 2 decimal places. No marks for units. 14) A 100. mL sample of river water is filtered to remove total suspended solids (TSS) and poured into an aluminum pan and dried. The masses are: Mass of aluminum pan and boiling chip = 6,140 mg Mass of aluminum pan, dried TDS, and boiling chip = 6,234 mg What is the TDS in mg/L? Report your answer to 3 decimal places with no units.

          13) The amount of iron in a meteorite was determined by a redox titration using KMnO4 as the titrant. A 0.723 g sample was dissolved in acid, and the liberated Fe3+ quantitatively reduced to Fe2+. Titrating with 0.028 M KMnO4 requires 44.71 mL to reach the endpoint.
Unbalanced reaction: Fe2+ + MnO4- -> Fe3+ + Mn2+.
Determine the % w/w Fe2O3.
Report your answer to 2 decimal places.
No marks for units.

14) A 100. mL sample of river water is filtered to remove total suspended solids (TSS) and poured into an aluminum pan and dried. The masses are:
Mass of aluminum pan and boiling chip = 6,140 mg
Mass of aluminum pan, dried TDS, and boiling chip = 6,234 mg
What is the TDS in mg/L? Report your answer to 3 decimal places with no units.

Added by Bradley C.

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