Phosphoric acid

August 29th, 2008 by

This article is about orthophosphoric acid. For other acids commonly called “phosphoric acid”, see Phosphoric acids and phosphates.
Phosphoric acid

IUPAC name
trihydroxidooxidophosphorus
phosphoric acid
Other names
Orthophosphoric acid
Identifiers
CAS number
Properties
Molecular formula
H3PO4
Molar mass
98.0 g/mol
Appearance
white solid or
colourless, viscous liquid (>42°C)
Density
1.685 g/ml (liquid)
Melting point
42.35 °C, 316 K, 108 °F
Boiling point
158 °C, 431 K, 316 °F (decomp.)
Acidity (pKa)
2.12, 7.21, 12.67
Viscosity
85% aqueous solution
 ? cP
Hazards
EU classification
Corrosive(C)
NFPA 704

0
3
0
COR
R-phrases
R34
S-phrases
(S1/2), S26, S45
Related compounds
Related Phosphorus acid
Hypophosphorous [...]

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