Zinc Hydroxide Precipitation

ZnSO4 + 2NaOH → Zn(OH)2↓ + Na2SO4

概要

Zinc sulfate reacts with sodium hydroxide to form a white gelatinous precipitate of zinc hydroxide (Ksp = 3.0 × 10⁻¹⁷). Zn(OH)₂ is amphoteric, dissolving in excess NaOH to form the zincate ion [Zn(OH)₄]²⁻. This amphoteric behavior is a diagnostic test for zinc in qualitative analysis.

参加者

役割 物質 係数 状態
反応物 Zinc Sulfate ZnSO₄ 1 (aq)
反応物 Sodium Hydroxide NaOH 2 (aq)
生成物 Sodium Sulfate Na₂SO₄ 1 (aq)

日常の例

Calamine lotion contains zinc compounds that form protective precipitates on skin, soothing itching from insect bites and rashes.

産業上の重要性

水酸化亜鉛の沈殿は排水からの亜鉛回収、カラミンローションの製造、酸化亜鉛の前駆体として使用される。

特性

タイプ
Precipitation
可逆的
いいえ
エネルギー
発熱性
ΔH
-38.0 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 Zinc Hydroxide Precipitation?
The balanced equation is: ZnSO₄ + 2NaOH → Zn(OH)₂↓ + Na₂SO₄.
What type of reaction is Zinc Hydroxide Precipitation?
Zinc Hydroxide Precipitation is a precipitation reaction.
Is Zinc Hydroxide Precipitation exothermic or endothermic?
Zinc Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -38.0 kJ/mol.