Copper Sulfide Precipitation
CuSO4 + Na2S → CuS↓ + Na2SO4
Обзор
Copper sulfate reacts with sodium sulfide to form a black precipitate of copper(II) sulfide (Ksp = 1.3 × 10⁻³⁶). CuS is one of the most insoluble compounds known. The jet-black precipitate forms instantly and is used to identify Cu²⁺ ions in systematic qualitative analysis.
Участники
| Роль | Вещество | Коэффициент | Состояние |
|---|---|---|---|
| Реагент | Copper(II) Sulfate CuSO₄ | 1 | (aq) |
| Продукт | Sodium Sulfate Na₂SO₄ | 1 | (aq) |
Пример из жизни
The black tarnish on copper pots exposed to sulfur-containing foods (eggs, garlic) is related to copper sulfide formation.
Промышленное значение
Sulfide precipitation is used in mining wastewater treatment to remove heavy metals. CuS (covellite) is also a naturally occurring copper ore mineral.
Свойства
- Тип
- Precipitation
- Обратимая
- Нет
- Энергия
- Экзотермическая
- ΔH
- -84,0 kJ/mol
Связанные реакции
Aluminum Hydroxide Precipitation
Barium Sulfate Precipitation
Cadmium Sulfide Precipitation (Yellow)
Calcium Phosphate Precipitation (Bone Mineral)
Chromium(III) Hydroxide Precipitation
Lead Carbonate Precipitation
Magnesium Hydroxide Precipitation
Cobalt(II) Hydroxide Precipitation
Mercury(II) Sulfide Precipitation (Vermilion)
Iron(III) Hydroxide Precipitation
Frequently Asked Questions
What is the equation for Copper Sulfide Precipitation?
The balanced equation is: CuSO₄ + Na₂S → CuS↓ + Na₂SO₄.
What type of reaction is Copper Sulfide Precipitation?
Copper Sulfide Precipitation is a precipitation reaction.
Is Copper Sulfide Precipitation exothermic or endothermic?
Copper Sulfide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -84.0 kJ/mol.