Phosphoric Acid and Sodium Hydroxide (First Neutralization)

H3PO4 + NaOH → NaH2PO4 + H2O

Aperçu

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.

Participants

Rôle Substance Coefficient État
Réactif Phosphoric Acid H₃PO₄ 1 (aq)
Réactif Sodium Hydroxide NaOH 1 (aq)
Produit Water H₂O 1 (l)

Exemple du quotidien

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

Importance industrielle

Monosodium phosphate is used in food processing, water treatment, and as a buffering agent in pharmaceutical formulations.

Propriétés

Type
Acid-Base
Réversible
Non
Énergie
Exothermique
ΔH
-56,0 kJ/mol

Réactions associées

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.