Write the ion-product expressions for a) iron(III) hydroxide b) barium phosphate c) magnesium fluoride

Ksp = [Fe³⁺].[OH⁻]³

Ksp = [Ba²⁺]³.[PO₄³⁻]²

Ksp = [Mg²⁺].[F⁻]²

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

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.