Zinc Hydroxide Precipitation

ZnSO4 + 2NaOH → Zn(OH)2↓ + Na2SO4

概述

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.

参与者

角色 物质 系数 状态
反应物 Zinc Sulfate ZnSO₄ 1 (aq)
反应物 Sodium Hydroxide NaOH 2 (aq)
产物 Sodium Sulfate Na₂SO₄ 1 (aq)

日常示例

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

工业重要性

氢氧化锌沉淀用于锌的回收提纯、锌基催化剂前体制备和锌白（氧化锌）颜料的合成。

属性

类型
Precipitation
可逆
否
能量
放热
ΔH
-38.0 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 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.