Neco Model Questions Vol1 2017 Chemistry Question 41

Practice objective / multiple choice question 41 from the 2017 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Medium Difficulty
Question 41 NECO_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

Calcium fluoride, CaF$_{2}$, has a solubility product $K_{sp}=1.5\times10^{-10}$ at 25\,°C. (a) Calculate its molar solubility in pure water at this temperature. (b) If 0.010\,mol\,L$^{-1}$ NaF is added to the solution, determine the new molar solubility of CaF$_{2}$ at 25\,°C. (c) When the temperature is raised so that the solubility product doubles, what is the solubility of CaF$_{2}$ in the 0.010\,mol\,L$^{-1}$ NaF solution?

Answer Options

A. s₀ = 4.0×10⁻⁴ M; s₁ = 1.0×10⁻⁶ M; s₂ = 2.5×10⁻⁶ M
Correct Answer B. s₀ = 3.3×10⁻⁴ M; s₁ = 1.5×10⁻⁶ M; s₂ = 3.0×10⁻⁶ M
C. s₀ = 2.5×10⁻⁴ M; s₁ = 2.0×10⁻⁶ M; s₂ = 4.0×10⁻⁶ M
D. s₀ = 3.0×10⁻⁴ M; s₁ = 2.5×10⁻⁶ M; s₂ = 5.0×10⁻⁶ M
Correct Answer
B
Correct Option:
s₀ = 3.3×10⁻⁴ M; s₁ = 1.5×10⁻⁶ M; s₂ = 3.0×10⁻⁶ M

About This Question

This is Neco Model Questions Vol1 2017 Chemistry Question 41. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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