Copper Sulfide Precipitation

CuSO4 + Na2S → CuS↓ + Na2SO4

概述

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.

参与者

角色 物质 系数 状态
反应物 Copper(II) Sulfate CuSO₄ 1 (aq)
产物 Sodium Sulfate Na₂SO₄ 1 (aq)

日常示例

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

工业重要性

硫化物沉淀用于矿业废水处理以去除重金属。CuS(铜蓝)也是一种天然存在的铜矿物。

属性

类型
Precipitation
可逆
否
能量
放热
ΔH
-84.0 kJ/mol

相关反应

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.