Neco 2025 Chemistry Question 8

Practice essay / theory question 8 from the 2025 Neco Chemistry examination. This question covers Solubility, Ksp, Common‑ion effect, Temperature dependence of solubility .

Neco 2025 Chemistry Essay / Theory
Topics: Solubility Ksp Common‑ion effect Temperature dependence of solubility
Question 8 NECO • 2025 • CHEMISTRY • essay

A laboratory investigation studies the solubility of calcium fluoride (CaF\(_2\)) and the effect of adding a soluble fluoride source and of raising the temperature. Answer the following questions.

Question Parts

( a )
Given \(K_{sp}\) of CaF\(_2\) = 1.5 \times 10^{-10} at 25°C, calculate its molar solubility (s) in pure water at this temperature.
( b )
If 0.10 mol of NaF is added to 1.00 L of water, calculate the new solubility of CaF\(_2\) in this solution at 25°C.
( c )
The solution from part (b) is then heated to 35°C where the \(K_{sp}\) of CaF\(_2\) becomes 3.0 \times 10^{-10}. Assuming the fluoride concentration from NaF remains essentially unchanged, calculate the solubility of CaF\(_2\) at 35°C in the presence of the added NaF.

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About This Question

This is Neco 2025 Chemistry Question 8. It is one of the essay questions from the 2025 Neco Chemistry examination.

The question covers Solubility, Ksp, Common‑ion effect, Temperature dependence of solubility .

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