Phosphoric acid

Frae Wikipedia
Lowp tae: navigation, rake
Phosphoric acid
Structural formula ophosphoric acid, shawin dimensions
Baw-an-stick model
Space-fillin model
Names
IUPAC name
Phosphoric acid; trihydroxidooxidophosphorus
Ither names
Orthophosphoric acid; Trihydroxylphosphine oxide
Identifiers
Jmol-3D images Image
ChEBI CHEBI:26078 YesY
ChEMBL ChEMBL1187 YesY
ChemSpider 979 YesY
ECHA InfoCard 100.028.758
EC Nummer 231-633-2
E nummer E338 (antioxidants, ...)
KEGG D05467 YesY
RTECS nummer TB6300000
UNII E4GA8884NN YesY
UN nummer 1805
Properties
H3O4P
Molar mass 97.99 g·mol−1
Appearance white solit or colourless, viscous liquid (>42 °C)
deliquescent
Odour odorless
Density 1.885 g/mL (liquid)
1.685 g/mL (85% solution)
2.030 g/mL (creestal at 25 °C)
Meltin pynt 42.35 °C (108.23 °F; 315.50 K)
(anhydrous)
29.32 °C (84.78 °F; 302.47 K)
(hemihydrate)
Bylin pynt 158 °C (316 °F; 431 K)
213 °C (415 °F; 486 K)
decompones
392.2 g/100 g (−16.3 °C)
369.4 g/100 mL (0.5 °C)
446 g/100 mL (14.95 °C)
miscible (42.3 °C)[1]
Solubility soluble in ethanol
Vapour pressur 0.03 mmHg (20°C)[2]
Acidity (pKa) pKa1 = 2.148
pKa2 = 7.198
pKa3 = 12.319
Magnetic susceptibility −43.8·10−6 cm3/mol
Refractive index (nD) 1.3420 (8.8% w/w aq. soln)[3]
1.4320 (85% aq. soln) 25 °C
Viscosity 2.4–9.4 cP (85% aq. soln.)
147 cP (100%)
Structur
monoclinic
Thermochemistry
Staundart molar
entropy
So298
158 J/(mol·K)[4]
Std enthalpy o
formation
ΔfHo298
−1288 kJ/mol[4]
Hazards
Safety data sheet ICSC 1008
GHS pictograms The corrosion pictogram in the Globally Harmonized Seestem o Classification an Labelling o Chemicals (GHS)[5]
GHS signal wird Corrosive
GHS hazard statements H290, H314[5]
GHS precautionary statements P280, P305+351+338, P310[5]
EU clessification Corrosive C
R-phrases R34
S-phrases (S1/2), S26, S45
NFPA 704
Flammability code 0: Will nae burn. E.g., watter Health code 3: Short exposur could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even unner fire exposur condeetions, an is nae reactive wi watter. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash pynt Non-flammable
Lethal dose or concentration (LD, LC):
1530 mg/kg (rat, oral)[6]
US health exposure limits (NIOSH):
TWA 1 mg/m3[2]
TWA 1 mg/m3 ST 3 mg/m3[2]
1000 mg/m3[2]
Relatit compoonds
Hypophosphorous acid
Phosphorous acid
Pyrophosphoric acid
Triphosphoric acid
Perphosphoric acid
Permonophosphoric acid
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
YesY verify (whit is YesYN ?)
Infobox references

Phosphoric acid (an aa kent as orthophosphoric acid or phosphoric(V) acid) is a meeneral (inorganic) acid haein the chemical formula H3PO4.

References[eedit | eedit soorce]

  1. Seidell, Atherton; Linke, William F. (1952). Solubilities of Inorganic and Organic Compounds. Van Nostrand. Retrieved 2014-06-02. 
  2. 2.0 2.1 2.2 2.3 NIOSH Pocket Guide tae Chemical Hazards 0506
  3. O. W. Edwards, R. L. Dunn, J. D. Hatfield (1964). "Refractive Index of Phosphoric Acid Solutions at 25 C". J. Chem. Eng. Data. doi:10.1021/je60023a010. 
  4. 4.0 4.1 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 0-618-94690-X. 
  5. 5.0 5.1 5.2 Sigma-Aldrich Co., Phosphoric acid. Retrieved on 2014-05-09.
  6. "Phosphoric acid". Immediately Dangerous to Life and Health. National Institute for Occupational Safety and Health (NIOSH).