Answer:
Ksp = [Fe³⁺].[OH⁻]³
Ksp = [Ba²⁺]³.[PO₄³⁻]²
Ksp = [Mg²⁺].[F⁻]²
Step-by-step explanation:
a) Let's write the reaction for the solution of iron(III) hydroxide.
Fe(OH)₃(s) ⇄ Fe³⁺(aq) + 3 OH⁻(aq)
The solubility product constant is:
Ksp = [Fe³⁺].[OH⁻]³
b) Let's write the reaction for the solution of barium phosphate.
Ba₃(PO₄)₂(s) ⇄ 3 Ba²⁺(aq) + 2 PO₄³⁻(aq)
The solubility product constant is:
Ksp = [Ba²⁺]³.[PO₄³⁻]²
c) Let's write the reaction for the solution of magnesium fluoride.
MgF₂(s) ⇄ Mg²⁺(aq) + 2 F⁻(aq)
The solubility product constant is:
Ksp = [Mg²⁺].[F⁻]²