Neco 2019 Chemistry Question 16

Practice objective / multiple choice question 16 from the 2019 Neco Chemistry examination.

Neco 2019 Chemistry Objective / Multiple Choice Medium Difficulty

Question 16 NECO • 2019 • CHEMISTRY • objective

An aqueous solution at 25\(^\circ\)C is saturated with calcium fluoride, CaF\(_2\). The solubility product at this temperature is \(K_{sp}=1.5\times10^{-10}\). Initially the solution is at equilibrium. Then 0.010 mol of NaF is added to 1.00 L of this saturated solution, and the volume change is negligible. Calculate the concentration of Ca\(^{2+}\) ions in the solution after the system re‑establishes equilibrium.

Correct Answer A. 1.3\times10^{-6}\,\text{M}

B. 1.3\\times10^{-5}\\,\\text{M}

C. 3.0\\times10^{-6}\\,\\text{M}

D. 1.0\\times10^{-6}\\,\\text{M}

Correct Answer

Correct Option:

1.3\times10^{-6}\,\text{M}

This is Neco 2019 Chemistry Question 16. It is one of the objective questions from the 2019 Neco Chemistry examination.

Difficulty level: Medium .

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