Neco Model Questions Vol1 2021 Chemistry Question 8

Practice essay / theory question 8 from the 2021 Neco Model Questions Vol1 Chemistry examination. This question covers solubility, solubility_product, common_ion_effect .

Neco Model Questions Vol1 2021 Chemistry Essay / Theory
Topics: solubility solubility_product common_ion_effect
Question 8 NECO_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay
Neco Model Questions Vol1 2021 Chemistry Question 8 diagram

A student carried out an experiment to determine the solubility product constant (Ksp) of calcium fluoride, CaF₂, at 25 °C using the apparatus shown in the diagram. A 500 mL sample of the saturated solution was filtered, and the precipitate obtained was dried and weighed. The mass of the dried CaF₂ precipitate was 0.236 g. The molar mass of CaF₂ is 78.07 g mol⁻¹. Using this information, answer the following:

Question Parts

( a )
Calculate the molar solubility (s) of CaF₂ in the saturated solution at 25 °C (in mol L⁻¹).
( b )
From the molar solubility obtained in part (a), calculate the solubility product constant Ksp for CaF₂ at 25 °C.
( c )
If 0.10 M NaF is added to the saturated solution, predict the new molar solubility of CaF₂ and calculate its value (in mol L⁻¹). Assume the common‑ion effect and that the change in [F⁻] due to CaF₂ dissolution is negligible compared with 0.10 M.
( d )
Explain, with reference to Le Chatelier’s principle and the ionic equilibrium, why the addition of the common ion (F⁻) reduces the solubility of CaF₂.

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About This Question

This is Neco Model Questions Vol1 2021 Chemistry Question 8. It is one of the essay questions from the 2021 Neco Model Questions Vol1 Chemistry examination.

The question covers solubility, solubility_product, common_ion_effect .

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