Magnesium Hydroxide Precipitation

MgCl2 + 2NaOH → Mg(OH)2↓ + 2NaCl

概述

Magnesium chloride reacts with sodium hydroxide to form a white precipitate of magnesium hydroxide (Ksp = 5.6 × 10⁻¹²). The milky white suspension is commonly known as milk of magnesia. Mg(OH)₂ is a weak base that slowly neutralizes acid.

参与者

角色 物质 系数 状态
反应物 Sodium Hydroxide NaOH 2 (aq)
产物 Magnesium Hydroxide Mg(OH)₂ 1 (s)
产物 Sodium Chloride NaCl 2 (aq)

日常示例

Milk of magnesia antacid is a suspension of this precipitate that neutralizes stomach acid gradually and acts as a gentle laxative.

工业重要性

氢氧化镁是重要的无卤阻燃剂（正在替代溴系阻燃剂）、抗酸药和废水处理中重金属沉淀剂，年用量数十万吨。

属性

类型
Precipitation
可逆
否
能量
放热
ΔH
-41.0 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 Magnesium Hydroxide Precipitation?
The balanced equation is: MgCl₂ + 2NaOH → Mg(OH)₂↓ + 2NaCl.
What type of reaction is Magnesium Hydroxide Precipitation?
Magnesium Hydroxide Precipitation is a precipitation reaction.
Is Magnesium Hydroxide Precipitation exothermic or endothermic?
Magnesium Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -41.0 kJ/mol.