Iron(III) Hydroxide Precipitation

FeCl3 + 3NaOH → Fe(OH)3↓ + 3NaCl

概述

Iron(III) chloride reacts with sodium hydroxide to form a rust-brown gelatinous precipitate of iron(III) hydroxide. Fe(OH)₃ has an extremely low Ksp of 2.8 × 10⁻³⁹, precipitating even at slightly acidic pH. The gelatinous nature makes it an excellent flocculant for water treatment.

参与者

角色 物质 系数 状态
反应物 Iron(III) Chloride FeCl₃ 1 (aq)
反应物 Sodium Hydroxide NaOH 3 (aq)
产物 Sodium Chloride NaCl 3 (aq)

日常示例

The rust-colored sludge in water treatment plants is mainly iron(III) hydroxide precipitated by adding base to iron-rich water.

工业重要性

氢氧化铁沉淀是饮用水除铁的首选方法，也是污水处理中重要的絮凝剂，用于去除磷酸盐、重金属和悬浮固体，全球水处理行业每年消耗大量铁盐絮凝剂。

属性

类型
Precipitation
可逆
否
能量
放热
ΔH
-88.0 kJ/mol

相关反应

Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Phosphate Precipitation (Bone Mineral) Chromium(III) Hydroxide Precipitation Lead Carbonate Precipitation Magnesium Hydroxide Precipitation Copper Sulfide Precipitation Cobalt(II) Hydroxide Precipitation Mercury(II) Sulfide Precipitation (Vermilion) Aluminum Hydroxide Precipitation

Frequently Asked Questions

What is the equation for Iron(III) Hydroxide Precipitation?
The balanced equation is: FeCl₃ + 3NaOH → Fe(OH)₃↓ + 3NaCl.
What type of reaction is Iron(III) Hydroxide Precipitation?
Iron(III) Hydroxide Precipitation is a precipitation reaction.
Is Iron(III) Hydroxide Precipitation exothermic or endothermic?
Iron(III) Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -88.0 kJ/mol.