Copper Sulfide Precipitation

CuSO4 + Na2S → CuS↓ + Na2SO4

概要

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.

参加者

役割 物質 係数 状態
反応物 Copper(II) Sulfate CuSO₄ 1 (aq)
生成物 Sodium Sulfate Na₂SO₄ 1 (aq)

日常の例

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

産業上の重要性

硫化物沈殿は鉱業排水処理で重金属を除去するために使用されています。CuS(コベリン)は天然の銅鉱石鉱物でもあります。

特性

タイプ
Precipitation
可逆的
いいえ
エネルギー
発熱性
ΔH
-84.0 kJ/mol

関連する反応

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.