### Educational Website Content#### Question 16**What is the solubility of Ca(OH)₂ in 0.0860 M Ba(OH)₂?** The K_sp for Ca(OH)₂ is known to be 4.68 x 10⁻⁶.#### Question 17**A buffer solution was made by dissolving 10.0 grams of sodium acetate in 200.0 mL of 1.00 M acetic acid.** Assuming the change in volume when the sodium acetate is not significant, estimate the pH of the acetic acid/sodium acetate buffer solution. The K_a for acetic acid is 1.7 x 10⁻⁵.#### Question 18**Determine the oxidation number of each element in the following compounds:**- (a) BaO₂- (b) (NH₄)₂MoO₄- (c) Na₃Co(NO₂)₆- (d) CS₂#### Question 19**Identify the species being oxidized and reduced in each of the following reactions:**a. Cr⁺ + Sn⁴⁺ → Cr³⁺ + Sn²⁺b. 3 Hg²⁺ + 2 Fe (s) → 3 Hg₂ + 2 Fe³⁺---These questions involve solubility equilibrium, buffer solutions, oxidation states, and redox reactions, providing a comprehensive approach to understanding key chemical principles.

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16. What is the solubility of Ca(OH)2 in 0.0860 M Ba(OH)2? The Ksp for Ca(OH)2 is known to be 4.68 x 106.

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