Gce Model Questions Vol1 2022 Chemistry Question 50

Practice objective / multiple choice question 50 from the 2022 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 50 GCE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

Calcium fluoride has a solubility product \(K_{sp}=3.9\times10^{-11}\) at \(25^\circ\text{C}\). A solution is prepared by dissolving \(0.010\ \text{mol}\) of calcium chloride in \(1.00\ \text{L}\) of water, after which excess solid calcium fluoride is added and equilibrium is established. (a) Calculate the concentration of fluoride ions at equilibrium. (b) If \(0.010\ \text{mol}\) of calcium fluoride was initially added, what mass of calcium fluoride remains undissolved? (c) The solution is then diluted to \(2.00\ \text{L}\). What is the new solubility of calcium fluoride (in \(\text{mol L}^{-1}\)) under the same conditions?

Answer Options

Correct Answer A. a) [F⁻] = 6.2×10⁻⁵ M; b) 0.78 g CaF₂ precipitated; c) 4.4×10⁻⁵ mol L⁻¹
B. a) [F⁻] = 5.5×10⁻⁵ M; b) 0.70 g CaF₂ precipitated; c) 4.9×10⁻⁵ mol L⁻¹
C. a) [F⁻] = 7.8×10⁻⁵ M; b) 0.92 g CaF₂ precipitated; c) 3.9×10⁻⁵ mol L⁻¹
D. a) [F⁻] = 4.9×10⁻⁵ M; b) 0.65 g CaF₂ precipitated; c) 5.1×10⁻⁵ mol L⁻¹
Correct Answer
A
Correct Option:
a) [F⁻] = 6.2×10⁻⁵ M; b) 0.78 g CaF₂ precipitated; c) 4.4×10⁻⁵ mol L⁻¹

About This Question

This is Gce Model Questions Vol1 2022 Chemistry Question 50. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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