Neco 2024 Chemistry Question 18

Practice objective / multiple choice question 18 from the 2024 Neco Chemistry examination.

Neco 2024 Chemistry Objective / Multiple Choice Medium Difficulty
Question 18 NECO • 2024 • CHEMISTRY • objective

The solubility product of calcium fluoride at 25 °C is \(K_{sp}=1.5\times10^{-10}\). A solution already contains 0.010 M NaF. Calculate the maximum concentration of \(\mathrm{Ca^{2+}}\) that can exist in this solution at equilibrium and give the mass of CaF\(_2\) that can dissolve per litre of solution.

Answer Options

A. [Ca^{2+}] = 1.5×10⁻⁸ M; CaF₂ that can dissolve = 1.17×10⁻⁶ g L⁻¹ (≈0.00117 mg L⁻¹)
B. [Ca^{2+}] = 6.0×10⁻⁶ M; CaF₂ that can dissolve = 4.68×10⁻⁴ g L⁻¹ (≈0.468 mg L⁻¹)
C. [Ca^{2+}] = 1.2×10⁻⁵ M; CaF₂ that can dissolve = 9.37×10⁻⁴ g L⁻¹ (≈0.937 mg L⁻¹)
Correct Answer D. [Ca^{2+}] = 1.5×10⁻⁶ M; CaF₂ that can dissolve = 1.17×10⁻⁴ g L⁻¹ (≈0.117 mg L⁻¹)
Correct Answer
D
Correct Option:
[Ca^{2+}] = 1.5×10⁻⁶ M; CaF₂ that can dissolve = 1.17×10⁻⁴ g L⁻¹ (≈0.117 mg L⁻¹)

About This Question

This is Neco 2024 Chemistry Question 18. It is one of the objective questions from the 2024 Neco Chemistry examination.

Difficulty level: Medium .

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