Phosphoric Acid Second Neutralization

H3PO4 + 2NaOH → Na2HPO4 + 2H2O

Aperçu

Partial neutralization of phosphoric acid with two equivalents of NaOH produces disodium hydrogen phosphate. This salt forms solutions near pH 9.2 and is one component of the phosphate buffer system widely used in biochemistry. The dibasic form is the predominant species at physiological pH.

Participants

Rôle Substance Coefficient État
Réactif Phosphoric Acid H₃PO₄ 1 (aq)
Réactif Sodium Hydroxide NaOH 2 (aq)
Produit Water H₂O 2 (l)

Exemple du quotidien

Phosphate buffer saline (PBS) used in biology labs contains disodium hydrogen phosphate to maintain pH around 7.4.

Importance industrielle

Disodium hydrogen phosphate is used in food processing as an emulsifier, in water treatment, and in pharmaceutical formulations as a buffering agent.

Propriétés

Type
Acid-Base
Réversible
Non
Énergie
Exothermique
ΔH
-112,0 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 Second Neutralization?
The balanced equation is: H₃PO₄ + 2NaOH → Na₂HPO₄ + 2H₂O.
What type of reaction is Phosphoric Acid Second Neutralization?
Phosphoric Acid Second Neutralization is a acid-base reaction.
Is Phosphoric Acid Second Neutralization exothermic or endothermic?
Phosphoric Acid Second Neutralization is exothermic (releases energy). The enthalpy change (ΔH) is -112.0 kJ/mol.