Phosphorus Pentoxide

Buy p2o5 phosphorus pentoxide in Mumbai, India

Diphosphorus Pentoxide

CAS Number:1314‑56‑3

Synonyms:Phosphorus pentoxide; Diphosphorus pentoxide; Phosphoric anhydride; Eaton's reagent

Chemical Formula:P₂O₅ (actual polymer is P₄O₁₀)

Molecular Weight:141.94 g/mol (per P₂O₅ unit)

Product Introduction

A white, extremely hygroscopic crystalline or powder form. P₂O₅ is a powerful and exothermic dehydrating agent used to achieve anhydrous conditions, convert carboxylic acids to anhydrides, dry solvents or gases, and produce high-purity phosphoric acid.

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Physical & Chemical Properties

Property Value
Appearance White crystalline/deliquescent powder
Odor Typically odorless; pungent on hydration
Density @ 25 °C ~2.30–2.39 g/cm³
Melting Point ~340 °C (decomposes/sublimes)
Sublimation Point ~360 °C
Vapor Pressure ~1 mm Hg @384 °C
Solubility in Water Reacts violently, hydrolyzing to metaphosphoric/orthophosphoric acids
pH of 5 g/L suspension ~1
Vapor Density ~4.9 × air
Refractive Index (solid) ~1.433–1.436
Flash Point Non-combustible solid

Applications

  • Desiccant/dehydrating agent for chemical synthesis, solvents, and gases
  • Reagentin dehydration to prepare amides → nitriles, carboxylic acids → anhydrides, oxidation reagents (Onodera reagent with DMSO)
  • Intermediate in preparing phosphoric acid, esters, optical glass, and heat-resistant materials

Safety & Handling

  • Corrosive and highly exothermic with water/humidity (GHS H314). Can cause severe burns and respiratory damage—handle with gloves, goggles, and in dry, ventilated hood. Store sealed, away from moisture and oxidizers. UN 1807, Class 8.

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