Igcse Model Questions Vol1 2020 Chemistry Question 3

Practice objective / multiple choice question 3 from the 2020 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Medium Difficulty
Question 3 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

A saturated solution of calcium fluoride (CaF₂) at 25 °C has a fluoride ion concentration of \(6.6\times10^{-4}\) M. The solution is then mixed with enough solid sodium fluoride to raise the fluoride concentration to \(0.0100\) M. Given the solubility product \(K_{sp}=1.5\times10^{-10}\) for CaF₂ at 25 °C, calculate (a) the new equilibrium concentration of calcium ions, and (b) the mass of CaF₂ that will precipitate per litre of solution as a result of this addition. Assume the volume change is negligible.

Answer Options

A. 3.0\times10^{-6} M; 5.2\times10^{-2} g L^{-1}
Correct Answer B. 1.5\times10^{-6} M; 2.6\times10^{-2} g L^{-1}
C. 1.5\times10^{-5} M; 2.6\times10^{-3} g L^{-1}
D. 7.5\times10^{-7} M; 1.3\times10^{-2} g L^{-1}
Correct Answer
B
Correct Option:
1.5\times10^{-6} M; 2.6\times10^{-2} g L^{-1}

About This Question

This is Igcse Model Questions Vol1 2020 Chemistry Question 3. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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