FRQ — Practicals and Projects

Short answer·Standard multi-step (3/5)·Calculator allowed

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

20.0\,\mathrm{mL}

0.050\,\mathrm{M}

oxalic acid requires

16.0\,\mathrm{mL}

of acidified

\mathrm{KMnO_4}

for complete oxidation. For the reaction,

2\mathrm{MnO_4^-}

react with

5\mathrm{C_2O_4^{2-}}

. Find the molarity of

\mathrm{KMnO_4}

Total: 3 marks

(a) Find moles of oxalate used. (1 mark)

(b) Find moles of permanganate used. (1 mark)

Your response (optional — you can also work on paper)

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