Iron(II) Sulfide Precipitation

FeSO₄ + Na₂S → FeS↓ + Na₂SO₄

Aperçu

Iron(II) sulfate reacts with sodium sulfide to form a black precipitate of iron(II) sulfide (Ksp = 6 × 10⁻¹⁸). FeS reacts with dilute acids to produce hydrogen sulfide gas with its characteristic rotten egg smell. The mineral form is troilite, found in meteorites.

Participants

Rôle	Substance	Coefficient	État
Produit	Sodium Sulfate Na₂SO₄	1	(aq)

Exemple du quotidien

The black spots in hard-boiled eggs at the yolk-white junction are iron sulfide, formed by reaction of iron in the yolk with sulfur from the egg white.

Importance industrielle

Iron sulfide is encountered in the petroleum industry as a corrosion product in sour gas wells and is the mineral pyrrhotite in geological formations.

Propriétés

Type: Precipitation
Réversible: Non
Énergie: Exothermique
ΔH: -75,0 kJ/mol

Réactions associées

Aluminum Hydroxide Precipitation Barium Carbonate Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Fluoride Precipitation (Fluorite) Calcium Phosphate Precipitation (Bone Mineral) Chromium(III) Hydroxide Precipitation Lead Carbonate Precipitation Lead Chloride Precipitation Iron(III) Hydroxide Precipitation

Frequently Asked Questions

What is the equation for Iron(II) Sulfide Precipitation?

The balanced equation is: FeSO₄ + Na₂S → FeS↓ + Na₂SO₄.

What type of reaction is Iron(II) Sulfide Precipitation?

Iron(II) Sulfide Precipitation is a precipitation reaction.

Is Iron(II) Sulfide Precipitation exothermic or endothermic?

Iron(II) Sulfide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -75.0 kJ/mol.