Phosphoric Acid 7664-38-2 Adjusts pH and prevents scaling in boilers and cooling systems.

Phosphoric acid

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7664-38-2

1805

H3O4P

InChIKey=NBIIXXVUZAFLBC-UHFFFAOYSA-N

97.99520

98.00

231-633-2

E4GA8884NN

1008

80804

1805|3453

DTXSID5024263

C47670

Unstable orthorhombic crystals or clear syrupy liquid|Colorless, sparkling liquid or transparent, crystalline solid, depending on concentration and temperature. At 20 °C the 50% and 75% strengths are mobile liquids, the 85% is of syrupy consistency; the 100% acid is in the form of crystals.|Colorless viscous liquid|Thick, colorless crystalline solid [Note: Often used in an aqueous solution]

2809201900

Inorganic Acid

87.57000

-0.9286

Transparent liquid

1.834 g/cm³ @ Temp: 18 °C

42.35 °C

158 °C(lit.)

n20/D 1.433

Miscible

Storage Room low temperature ventilation drying ,Separate storage with H Pore forming agent、caustic soda

Vapour pressure, Pa at 25°C:

3.4 (vs air)

ADI 0 to 70 mg / kg (total phosphate content in terms of phosphorus, FAO / WHO, 2001). GRAS (FDA, § 182.1073, 2000). LD501530mg / kg (rat, oral). In case of daily intake of 2 ~ 4 g, it can cause mild diarrhea. The amount of sour agent used as a cola drink is 0.02% to 0.06%.

Noncombustible Solid

Odorless

Acid taste

pH = 1.5 (0.1 N aqueous solution)

pK1: 2.15; pK2: 7.09; pK3: 12.32

PH: 2.0-2.2 /DETERMINED IN 1% SOLN AND IN 10-50% SLURRIES OF INSOL COMPOUNDS/|IT FORMS 3 SERIES OF SALTS: PRIMARY PHOSPHATES; DIBASIC PHOSPHATES; AND TRIBASIC PHOSPHATES.|Easily supercooled into a glass; Heat of formation (crystalline): -306.2 Kcal/mol; Heat of solution: +2.79 Kcal/mol.|Acid containing about 88% orthophosphoric acid will frequently crystallize on prolonged cooling, forms hemihydrate; becomes anhydrous at 150 °C, gradually changes to pyrophosphoric acid at about 200 °C; above 300 °C, metaphosphoric acid; hot concentrated acid attacks porcelain and granite ware.|For more Other Experimental Properties (Complete) data for PHOSPHORIC ACID (9 total), please visit the HSDB record page.

Soluble in water with small release of heat.

Acids, Weak

PHOSPHORIC ACID reacts exothermically with bases. May react with active metals, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas. Can initiate the polymerization of certain classes of organic compounds. Reacts with cyanide compounds to release gaseous hydrogen cyanide. May generate flammable and/or toxic gases in contact with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and strong reducing agents. Forms explosive mixture with nitromethane. Reacts violently with sodium tetrahydroborate. In the presence of chlorides can corrode stainless steel to form explosive hydrogen gas. Emits toxic and irritating fumes of oxides of phosphorus when heated to decomposition [Lewis, 3rd ed., 1993, p. 1029].

Not flammable (USCG, 1999)

Noncombustible Solid

Corrosive to ferrous metals and alloys