Calculate the concentration of fluoride ions in a saturated barium fluoride (K_sp = 1.7 × 10^-6)solution.

Question

Quizplus · Accepted Answer

The dissolution of barium fluoride (BaF2) in water can be represented as: BaF2(s) ⇌ Ba²⁺(aq) + 2F⁻(aq). The Ksp expression is Ksp = [Ba²⁺][F⁻]². Let the solubility of BaF2 be 's'. Then [Ba²⁺] = s and [F⁻] = 2s. Substituting into the Ksp expression: 1.7 × 10⁻⁶ = s(2s)² = 4s³. Solving for 's' gives s = 7.6 × 10⁻³ M, and [F⁻] = 2s = 1.5 × 10⁻² M.

Calculate the Concentration of Fluoride Ions in a Saturated Barium