Periodic table of elements

Orthophosphoric acid [H3PO4]

SOLUBILITY:
water [H2O]: 548 (20°)
diethyl ether [C2H5OC2H5]: 525 (20°)
ethanol [C2H5OH]: soluble

PROPERTIES:
colourless monoclinic crystals
M (molar mass): 97,995 g/mol
MP (melting point): 42,35 °C
ТDT (decomposing temperature): 213 °C
Decomp. to (names of the decomposition products): пирофосфорная кислота, вода
D (density): 1,87 (20°, g/cm3, s.)
ΔHmelt (molar enthalpy of melting): 13 kJ/mol
ΔH°298 (Standard molar enthalpy of reaction at 298 К): -1279 (s) kJ/mol
ΔG°298 (standard molar Gibbs energy of reaction at 298 К): -1119,1 (s) kJ/mol
298 (standard molar entropy at 298 К): 110,5 (s) J/(mol•К)
p (standard molar heat capacity): 106,1 (s) J/(mol•К)
LD50 (median lethal doses for laboratory animals): 1250 (rats, o/s), 1250 (mice, o/s) mg/kg
pKa1 (acid dissociation constant): 2,12 (25°, water)
pKa2 (acid dissociation constant): 7,2 (25°, water)
pKa3 (acid dissociation constant): 11,9 (25°, water)
H0 (Hammett acidity function for pure substances): -5,2 (25°)
pKBH+ (index of the acidity constant of the protonated alkali): -3 (25°, water)

LITERARY REFERENCES:
• Vrednye veschestva v promyshlennosti: Spravochnik dlya himikov, inzhenerov i vrachey. - 7-e izd., T.3. - L.: Himiya, 1976. – P. 132-133
• Vrednye himicheskie veschestva: Neorganicheskie soedineniya elementov V-VIII grupp. Spravochnik. - L., 1989. – P. 73
• Spravochnik himika. - T.3. - M.-L.: Himiya, 1965. – P. 118
• Himicheskaya enciklopediya. - T.5. - M.: Sovetskaya enciklopediya, 1999. – P. 153-156
• Holleman A.F., Wiberg E., Wiberg N. Lehrbuch der Anorganischen Chemie. - Berlin: Walter de Gruyter, 1995. – P. 238
• Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1 - New York: D. Van Nostrand Company, 1940. – P. 592-594
• Lur'e Yu.Yu. Spravochnik po analiticheskoy himii. - M.: Himiya, 1979. – P. 91
• Nekrasov B.V. Osnovy obschey himii. - T.1. - M.: Himiya, 1973. – P. 449
• Rabinovich V.A., Havin Z.Ya. Kratkiy himicheskiy spravochnik. - L.: Himiya, 1977. – P. 109 219

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