Gce Model Questions Vol1 2019 Chemistry Question 4

Practice objective / multiple choice question 4 from the 2019 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2019 Chemistry Objective / Multiple Choice Medium Difficulty
Question 4 GCE_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • objective

Calcium fluoride, \(\mathrm{CaF_2}\), has a solubility product \(K_{sp}=3.9\times10^{-11}\) at 25 °C. (a) Calculate its molar solubility in pure water. (b) If 0.10 M NaF is added, determine the new solubility of \(\mathrm{CaF_2}\). (c) Explain qualitatively how the solubility would change on heating, given that the dissolution is endothermic.

Answer Options

Correct Answer A. a) 2.1×10⁻⁴ M; b) 3.9×10⁻⁹ M; c) Solubility increases with temperature (endothermic dissolution).
B. a) 1.0×10⁻⁴ M; b) 1.2×10⁻⁸ M; c) Solubility decreases with temperature (endothermic dissolution).
C. a) 2.1×10⁻⁴ M; b) 2.5×10⁻⁹ M; c) Solubility decreases with temperature (exothermic dissolution).
D. a) 3.9×10⁻⁴ M; b) 2.1×10⁻⁹ M; c) Solubility unchanged with temperature (endothermic dissolution).
Correct Answer
A
Correct Option:
a) 2.1×10⁻⁴ M; b) 3.9×10⁻⁹ M; c) Solubility increases with temperature (endothermic dissolution).

About This Question

This is Gce Model Questions Vol1 2019 Chemistry Question 4. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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