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

For CaF2\mathrm{CaF_2}, Ksp=3.2×1011K_{sp}=3.2\times10^{-11} at a certain temperature. Estimate its molar solubility in pure water.
Total: 4 marks

(a) Write KspK_{sp} in terms of ss. (2 marks)

(b) Calculate ss. (2 marks)

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cbse-chemistry-11.u6.t6-5.saq.006

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