FRQ — Equilibrium

Short answer·Hard exam skill (4/5)·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

Will

\mathrm{AgCl}

precipitate when

10.0\,\mathrm{mL}

1.0\times10^{-4}\,\mathrm{M}\ \mathrm{AgNO_3}

is mixed with

10.0\,\mathrm{mL}

1.0\times10^{-4}\,\mathrm{M}\ \mathrm{NaCl}

? Take

K_{sp}(\mathrm{AgCl})=1.6\times10^{-10}

Total: 5 marks

(a) Find ion concentrations after mixing, before precipitation. (2 marks)

(b) Compare $Q_{sp}$ with $K_{sp}$ and conclude. (3 marks)

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

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