Gce Model Questions Vol1 2025 Chemistry Question 15

Practice objective / multiple choice question 15 from the 2025 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Medium Difficulty
Question 15 GCE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective

Calcium fluoride (\(\mathrm{CaF_{2}}\)) has a solubility in pure water of \(2.1\times10^{-4}\,\text{mol L}^{-1}\). (a) Calculate its solubility product \(K_{sp}\). (b) If the solution is saturated with \(0.010\;\text{M}\) sodium fluoride (\(\mathrm{NaF}\)), determine the new solubility of \(\mathrm{CaF_{2}}\) under these conditions.

Answer Options

A. Ksp = 1.2×10⁻⁹; solubility in 0.010 M NaF = 1.2×10⁻⁶ mol L⁻¹
B. Ksp = 2.5×10⁻¹⁰; solubility in 0.010 M NaF = 2.5×10⁻⁶ mol L⁻¹
Correct Answer C. Ksp = 3.7×10⁻¹¹; solubility in 0.010 M NaF = 3.7×10⁻⁷ mol L⁻¹
D. Ksp = 5.0×10⁻¹²; solubility in 0.010 M NaF = 5.0×10⁻⁸ mol L⁻¹
Correct Answer
C
Correct Option:
Ksp = 3.7×10⁻¹¹; solubility in 0.010 M NaF = 3.7×10⁻⁷ mol L⁻¹

About This Question

This is Gce Model Questions Vol1 2025 Chemistry Question 15. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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