Copper Sulfide Precipitation

CuSO4 + Na2S → CuS↓ + Na2SO4

개요

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.

참여 물질

역할 물질 계수 상태
반응물 Copper(II) Sulfate CuSO₄ 1 (aq)
생성물 Sodium Sulfate Na₂SO₄ 1 (aq)

일상 속 예시

The black tarnish on copper pots exposed to sulfur-containing foods (eggs, garlic) is related to copper sulfide formation.

산업적 중요성

황화물 침전은 중금속 제거를 위한 광산 폐수 처리에 사용됩니다. CuS(방연석)은 또한 자연적으로 발생하는 구리 광석 광물이기도 합니다.

성질

유형
Precipitation
가역 반응
아니오
에너지
발열
ΔH
-84.0 kJ/mol

관련 반응

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 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.