Neco Model Questions Vol1 2019 Chemistry Question 49

Practice objective / multiple choice question 49 from the 2019 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2019 Chemistry Objective / Multiple Choice Medium Difficulty
Question 49 NECO_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • objective

Calcium fluoride has a solubility product \(K_{sp}=1.5\times10^{-10}\) at 25 °C. A solution already contains 0.10 M \(\mathrm{NaF}\). (a) Calculate the maximum concentration of \(\mathrm{Ca^{2+}}\) that can be added without causing precipitation of \(\mathrm{CaF_2}\). (b) If 0.020 M \(\mathrm{CaCl_2}\) is added to the solution, will \(\mathrm{CaF_2}\) precipitate? Justify your answer.

Answer Options

A. a) 1.5×10⁻⁶ M; b) No, precipitation will not occur.
Correct Answer B. a) 1.5×10⁻⁸ M; b) Yes, precipitation will occur.
C. a) 5.0×10⁻⁹ M; b) Yes, but only minimal precipitation.
D. a) 2.0×10⁻⁸ M; b) No, solution remains unsaturated.
Correct Answer
B
Correct Option:
a) 1.5×10⁻⁸ M; b) Yes, precipitation will occur.

About This Question

This is Neco Model Questions Vol1 2019 Chemistry Question 49. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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