Gce Model Questions Vol1 2023 Chemistry Question 31

Practice objective / multiple choice question 31 from the 2023 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2023 Chemistry Objective / Multiple Choice Medium Difficulty
Question 31 GCE_MODEL_QUESTIONS_VOL1 • 2023 • CHEMISTRY • objective

A solution contains 0.050 M NaF. The solubility product of calcium fluoride is \(K_{sp}=3.9\times10^{-11}\). (a) Calculate the molar solubility of CaF\(_2\) in this solution. (b) The same solution also contains 0.001 M carbonate ions. The solubility product of calcium carbonate is \(K_{sp}=4.8\times10^{-9}\). When a small amount of Ca\(^{2+}\) ions is added, which solid, CaF\(_2\) or CaCO\(_3\), will begin to precipitate first? Give a brief justification.

Answer Options

A. (a) 2.5×10⁻⁸ M; (b) CaCO₃ precipitates first
Correct Answer B. (a) 1.6×10⁻⁸ M; (b) CaF₂ precipitates first
C. (a) 1.0×10⁻⁸ M; (b) CaCO₃ precipitates first
D. (a) 3.2×10⁻⁸ M; (b) CaCO₃ precipitates first
Correct Answer
B
Correct Option:
(a) 1.6×10⁻⁸ M; (b) CaF₂ precipitates first

About This Question

This is Gce Model Questions Vol1 2023 Chemistry Question 31. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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