Zinc Sulfide Precipitation
ZnSO4 + Na2S → ZnS↓ + Na2SO4
Overview
Zinc sulfate reacts with sodium sulfide to form a white precipitate of zinc sulfide (Ksp = 2 × 10⁻²⁵). ZnS occurs naturally as the mineral sphalerite, the most important zinc ore. Zinc sulfide phosphors are used in cathode ray tubes and luminous paints.
Participants
| Role | Substance | Coefficient | State |
|---|---|---|---|
| Reactant | Zinc Sulfate ZnSO₄ | 1 | (aq) |
| Product | Sodium Sulfate Na₂SO₄ | 1 | (aq) |
Everyday Example
Glow-in-the-dark toys and watch dials often use zinc sulfide phosphors doped with copper, which glow green after light exposure.
Industrial Importance
Sphalerite (ZnS) is the world's most important zinc ore. ZnS phosphors are used in display technology, X-ray screens, and luminescent coatings.
Properties
- Type
- Precipitation
- Reversible
- No
- Energy
- Exothermic
- ΔH
- -65.0 kJ/mol
Related Reactions
Aluminum Hydroxide Precipitation
Barium Carbonate Precipitation
Barium Sulfate Precipitation
Cadmium Sulfide Precipitation (Yellow)
Calcium Carbonate Precipitation
Calcium Fluoride Precipitation (Fluorite)
Calcium Oxalate Precipitation (Kidney Stones)
Calcium Phosphate Precipitation (Bone Mineral)
Calcium Sulfate Precipitation (Gypsum)
Chromium(III) Hydroxide Precipitation
Frequently Asked Questions
What is the equation for Zinc Sulfide Precipitation?
The balanced equation is: ZnSO₄ + Na₂S → ZnS↓ + Na₂SO₄.
What type of reaction is Zinc Sulfide Precipitation?
Zinc Sulfide Precipitation is a precipitation reaction.
Is Zinc Sulfide Precipitation exothermic or endothermic?
Zinc Sulfide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -65.0 kJ/mol.