Question

Is calcium fluoride more soluble in pure water or in an aqueous solution of sodium fluoride?

A) More soluble in pure water
B) More soluble in an aqueous solution of sodium fluoride
C) Equally soluble in both pure water and an aqueous solution of sodium fluoride
D) It depends on the concentration of calcium fluoride in the solution

Answer 1

Calcium fluoride is less soluble in an aqueous solution of sodium fluoride compared to pure water.

Step-by-step explanation:

Calcium fluoride (CaF2) is less soluble in an aqueous solution of sodium fluoride compared to pure water. When calcium fluoride is dissolved in water, it dissociates into calcium ions (Ca2+) and fluoride ions (F-). However, the addition of more fluoride ions from sodium fluoride will shift the equilibrium to the left, reducing the concentration of calcium ions and decreasing the solubility of calcium fluoride.