Sodium Sulfide and Copper(II) Sulfate
Na2S + CuSO4 → CuS + Na2SO4
Overview
Sodium sulfide reacts with copper(II) sulfate to form a black precipitate of copper(II) sulfide and sodium sulfate. CuS is extremely insoluble, making this a useful test for copper ions. The black precipitate forms instantly upon mixing.
Participants
| Role | Substance | Coefficient | State |
|---|---|---|---|
| Reactant | Copper(II) Sulfate CuSO₄ | 1 | (aq) |
| Product | Sodium Sulfate Na₂SO₄ | 1 | (aq) |
Everyday Example
The black tarnish on silver jewelry involves a similar sulfide precipitation reaction when silver contacts sulfur-containing substances.
Industrial Importance
Sulfide precipitation is used in mining wastewater treatment to remove heavy metals. Copper sulfide is also a copper ore mineral.
Properties
- Type
- Double Replacement
- Reversible
- No
- Energy
- Exothermic
- ΔH
- -84.0 kJ/mol
Related Reactions
Aluminum Hydroxide and Hydrochloric Acid
Ammonia and Hydrochloric Acid (White Smoke)
Barium Chloride and Sodium Sulfate Precipitation
Calcium Carbonate and Hydrochloric Acid
Calcium Chloride and Sodium Carbonate
Calcium Hydroxide and Carbon Dioxide (Limewater Test)
Calcium Hydroxide and Sulfuric Acid
Copper(II) Sulfate and Sodium Hydroxide
Iron(III) Chloride and Sodium Hydroxide
Lead Nitrate and Potassium Iodide (Golden Rain)
Frequently Asked Questions
What is the equation for Sodium Sulfide and Copper(II) Sulfate?
The balanced equation is: Na₂S + CuSO₄ → CuS + Na₂SO₄.
What type of reaction is Sodium Sulfide and Copper(II) Sulfate?
Sodium Sulfide and Copper(II) Sulfate is a double replacement reaction.
Is Sodium Sulfide and Copper(II) Sulfate exothermic or endothermic?
Sodium Sulfide and Copper(II) Sulfate is exothermic (releases energy). The enthalpy change (ΔH) is -84.0 kJ/mol.