Phosphoric Acid and Sodium Hydroxide (First Neutralization)

H3PO4 + NaOH → NaH2PO4 + H2O

概述

The first neutralization step of the triprotic phosphoric acid produces monosodium phosphate and water. Phosphoric acid has three ionizable protons with Ka1 = 7.1 × 10⁻³, Ka2 = 6.3 × 10⁻⁸, and Ka3 = 4.2 × 10⁻¹³. Each successive proton is progressively harder to remove.

参与者

角色 物质 系数 状态
反应物 Phosphoric Acid H₃PO₄ 1 (aq)
反应物 Sodium Hydroxide NaOH 1 (aq)
产物 Water H₂O 1 (l)

日常示例

Monosodium phosphate is used as a leavening agent in baking and as an emulsifier in processed cheese.

工业重要性

磷酸二氢钠用于食品添加剂、缓冲液配制和洗涤剂制造，是重要的工业化学品。

属性

类型
Acid-Base
可逆
否
能量
放热
ΔH
-56.0 kJ/mol

相关反应

Hydrochloric Acid and Barium Hydroxide Acetic Acid and Sodium Acetate Buffer System Acetic Acid Dissociation in Water Ammonia and Hydrochloric Acid Ascorbic Acid and Sodium Hydroxide Barium Hydroxide and Ammonium Thiocyanate (Endothermic) Carbonic Acid and Sodium Hydroxide Aluminum Hydroxide as Amphoteric Acid with NaOH Aluminum Chloride and Chloride Ion (Lewis Acid-Base) Formic Acid and Sodium Hydroxide

Frequently Asked Questions

What is the equation for Phosphoric Acid and Sodium Hydroxide (First Neutralization)?
The balanced equation is: H₃PO₄ + NaOH → NaH₂PO₄ + H₂O.
What type of reaction is Phosphoric Acid and Sodium Hydroxide (First Neutralization)?
Phosphoric Acid and Sodium Hydroxide (First Neutralization) is a acid-base reaction.
Is Phosphoric Acid and Sodium Hydroxide (First Neutralization) exothermic or endothermic?
Phosphoric Acid and Sodium Hydroxide (First Neutralization) is exothermic (releases energy). The enthalpy change (ΔH) is -56.0 kJ/mol.