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Phosphoric Acid 85%

CAS Number: 7664‑38‑2

Synonyms: Orthophosphoric acid; White phosphoric acid

Chemical Formula:H₃PO₄ (in ~15% H₂O)

Product Introduction

A clear, viscous, colorless to slightly amber liquid with no strong odor—often called "phosphoric syrup." At 85% concentration (w/w), this is the standard industrial grade, widely used across food, pharma, metal surface treatment, and electrolytic applications.

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Physical & Chemical Properties

Property	Value
Appearance	Clear, viscous liquid
Density	~1.685 g/mL @ 25 °C
Melting Point	~21 °C (tendency to crystallize at lower temps)
Boiling Point (85% soln)	~158 °C
pKa Values	2.15, 7.20, 12.32 (triprotic acid)
Vapor Pressure	~2–5 mmHg @ 20–25 °C
Vapor Density	~3.4 × air
Solubility	Miscible with water—forms buffer; soluble in alcohols

Applications

Food & pharma: Acidulant, buffer, and clean/etch agent—food-grade (FCC/NF).
Metal treatment & cleaning: Rust removal, solder flux formulations, pickling, anodizing.
Chemical feedstock: Producing sodium phosphates, calcium phosphates, fertilizers.
Electrolyte uses: In fuel cells and NMR standard solutions.
Construction/descaling: Cleaning cement smears, hard water stains, mineral deposits.