CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Phosphoric acid appears as a clear colorless liquid or transparent crystalline solid. The pure solid melts at 42.35 °C and has a density of 1.834 g / cm3. Liquid is usually an 85% aqueous solution. Shipped as both a solid and liquid. Corrosive to metals and tissue. Used in making fertilizers and detergents and in food processing. |
|---|---|
| Color/Form | Unstable orthorhombic crystals or clear syrupy liquid |
| Odor | Odorless |
| Taste | Acid taste |
| Boiling Point | greater than 266 °F at 760 mmHg (USCG, 1999) |
| Melting Point | 108 °F (NIOSH, 2023) |
| Solubility | Miscible (NIOSH, 2023) |
| Density | 1.892 at 77 °F (USCG, 1999) - Denser than water; will sink |
| Vapor Density | Relative vapor density (air = 1): 3.4 |
| Vapor Pressure | 0.03 mmHg (NIOSH, 2023) |
| LogP | -2.150 |
| Autoignition Temperature | Not flammable (USCG, 1999) |
| Decomposition | Combustion by-products include oxides of phosphorus. |
| Viscosity | 3.86 mPa.s (40% solution at 20 °C). |
| Corrosivity | Corrosive to ferrous metals and alloys |
| pH | pH = 1.5 (0.1 N aqueous solution) |
| Polymerization | Violent polymerization with: Azo compounds; Epoxides; And polymerizable compounds. |
| Refractive Index | Index of refraction: 1.34203 at 17.5 °C/D, 10% solution; 1.35032 at 17.5 °C/D, 20% solution; 1.35846 at 17.5 °C/D, 30% solution /Phosphoric acid solutions/ |
| Dissociation Constants | pK1: 2.15; pK2: 7.09; pK3: 12.32 |
| Other Experimental Properties | PH: 2.0-2.2 /DETERMINED IN 1% SOLN AND IN 10-50% SLURRIES OF INSOL COMPOUNDS/ |
| Chemical Classes | Toxic Gases & Vapors -> Acids, Inorganic |
COMPUTED DESCRIPTORS
| Molecular Weight | 97.995 g/mol |
|---|---|
| XLogP3 | -2.1 |
| Hydrogen Bond Donor Count | 3 |
| Hydrogen Bond Acceptor Count | 4 |
| Rotatable Bond Count | 0 |
| Exact Mass | 97.97689557 g/mol |
| Monoisotopic Mass | 97.97689557 g/mol |
| Topological Polar Surface Area | 77.8 Ų |
| Heavy Atom Count | 5 |
| Formal Charge | 0 |
| Complexity | 49.8 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Phosphoric acid appears as a clear colorless liquid or transparent crystalline solid. The pure solid melts at 42.35 °C and has a density of 1.834 g / cm3. Liquid is usually an 85% aqueous solution. Shipped as both a solid and liquid. Corrosive to metals and tissue. Used in making fertilizers and detergents and in food processing.