Igcse Model Questions Vol1 2018 Chemistry Question 5

Practice objective / multiple choice question 5 from the 2018 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2018 Chemistry Objective / Multiple Choice Medium Difficulty
Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • objective

Calcium fluoride has a solubility product \(K_{sp}=1.5\times10^{-10}\). A solution initially contains \(0.010\ \text{M}\) \(\text{Ca}^{2+}\). Sodium fluoride is added until the total fluoride concentration reaches \(0.001\ \text{M}\). (i) Calculate the minimum fluoride concentration required to start precipitation of \(\text{CaF}_2\). (ii) After addition, determine the equilibrium concentration of \(\text{Ca}^{2+}\) in the solution.

Answer Options

Correct Answer A. i) 1.2×10⁻⁴ M; ii) 1.5×10⁻⁴ M
B. i) 2.0×10⁻⁴ M; ii) 2.5×10⁻⁴ M
C. i) 1.2×10⁻⁴ M; ii) 2.0×10⁻⁴ M
D. i) 1.2×10⁻⁵ M; ii) 1.5×10⁻⁵ M
Correct Answer
A
Correct Option:
i) 1.2×10⁻⁴ M; ii) 1.5×10⁻⁴ M

About This Question

This is Igcse Model Questions Vol1 2018 Chemistry Question 5. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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