The K_sp of calcium fluoride is 3.9 × 10^-11. A 0.420 g sample of NaF and a 1.110 g sample of calcium chloride were added to a 1.000 liter volumetric flask, and distilled water was added to the mark. After placing the stopper and shaking the flask to dissolve as much chemicals as would dissolve, how many grams of precipitate, if any, would be formed?Hint: Find Q and compare to K_sp.

Question

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The solubility product (Ksp) of calcium fluoride (CaF2) is used to determine if a precipitate will form. Calculate the ion product (Q) using the concentrations of Ca²⁺ and F⁻ ions from the dissolved NaF and CaCl₂. If Q > Ksp, a precipitate forms. The calculations show that Q exceeds Ksp, leading to the formation of a precipitate. The mass of the precipitate is approximately 0.39 g.

The Ksp of Calcium Fluoride Is 3

The K_sp of Calcium Fluoride Is 3