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Phosphoric acid

CAS No.: 7664-38-2
Formula: H3O4P
Exact Mass: 97.97690
Molecular Weight: 97.99520
PSA: 87.57000
LogP: -0.92860
Description Feedback
Phosphoric acid (also known as orthophosphoric acid or phosphoric(V) acid) is a mineral (inorganic) acid having the chemical formula H3PO4. Orthophosphoric acid refers to phosphoric acid, which is the IUPAC name for this compound. The prefix ortho is used to distinguish the acid from related phosphoric acids, called polyphosphoric acids. Orthophosphoric acid is a non-toxic acid, which, when pure, is a solid at room temperature and pressure. The conjugate base of phosphoric acid is the dihydrogen phosphate ion, H 2PO− 4, which in turn has a conjugate base of hydrogen phosphate, HPO2− 4, which has a conjugate base of phosphate, PO3− 4. Phosphates are nutritious for all forms of life.
In addition to being a chemical reagent, phosphoric acid has a wide variety of uses, including as a rust inhibitor, food additive, dental and orthop(a)edic etchant, electrolyte, flux, dispersing agent, industrial etchant, fertilizer feedstock, and component of home cleaning products. Phosphoric acids and phosphates are also important in biology.
The most common source of phosphoric acid is an 85% aqueous solution; such solutions are colourless, odourless, and non-volatile. The 85% solution is a syrupy liquid, but still pourable. Although phosphoric acid does not meet the strict definition of a strong acid, the 85% solution is acidic enough to be corrosive. Because of the high percentage of phosphoric acid in this reagent, at least some of the orthophosphoric acid is condensed into polyphosphoric acids. For the sake of labeling and simplicity, the 85% represents H3PO4 as if it were all orthophosphoric acid. Dilute aqueous solutions of phosphoric acid exist in the ortho- form.

Properties Feedback
Appearance & Physical State:White solid or colourless viscous liquid (>42 °C)
Density:1.885 g/mL (liquid), 1.685 g/mL (85% solution), 2.030 g/mL (crystal at 25 °C)
Melting Point:42.35 °C (无水化合物), 29.32 °C (半水化合物)
Boiling Point:158ºC
Refractive Index:1.3420 (8.8% w/w aq. soln), 1.4320 (85% aq. soln) 25 °C
Water Solubility:MISCIBLE
Stability:Stable at room temperature in closed containers under normal storage and handling conditions.
Storage Condition:Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from metals. Corrosives area. Do not store in metal containers.
Vapor Pressure:2.2 mm Hg ( 20 °C)
Vapor Density:3.4 (vs air)

Safety Info Feedback

hazard declaration:H290; H302; H314
hazard declaration add:
waring notice:P280; P301 + P312 + P330; P303 + P361 + P353; P304 + P340 + P310; P305 + P351 + P338
Hazard Class:8
Safety Statements:S26-S45
HS Code:2809201900
Packing Group:III
WGK Germany:3
RIDADR:UN 3453 8/PG 3
Risk Statements:R34
Hazard Codes:C


Synthesis Route Total: 332 Synthesis Route
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