Home Categories Inorganic chemistry Phosphoric acid
A6710212

Phosphoric acid , Chromatography, 85-90% , 7664-38-2

Synonym(s):
o-Phosphoric acid, Orthophosphoric acid;Orthophosphoric acid;Orthophosphoric acid, o-Phosphoric acid;Phosphoric acid;Phosphoric acid solution

CAS NO.:7664-38-2

Empirical Formula: H3O4P

Molecular Weight: 98

MDL number: MFCD00011340

EINECS: 231-633-2

Update time: 2022-07-08

PRODUCT Properties

Melting point: ~40 °C(lit.)
Boiling point: 158 °C(lit.)
Density  1.685 g/mL at 25 °C(lit.)
vapor density  3.4 (vs air)
vapor pressure  2.2 mm Hg ( 20 °C)
refractive index  n20/D 1.433
FEMA  2900 | PHOSPHORIC ACID
storage temp.  no restrictions.
solubility  H2O: soluble
pka 2.1-7.2-12.3(at 25℃)
form  Solid or Viscous Liquid
Specific Gravity 1.7
color  ≤10(APHA)
PH 3.06(1 mM solution);2.26(10 mM solution);1.63(100 mM solution);
Odor Odorless
PH Range 1.5
Water Solubility  MISCIBLE
λmax λ: 260 nm Amax: ≤0.05
λ: 280 nm Amax: ≤0.04
Merck  14,7344
BRN  1921286
Exposure limits TLV-TWA 1 mg/m3 (ACGIH, MSHA, and OSHA); TLV-STEL 3 mg/m3 (ACGIH).
Dielectric constant 61.0
InChIKey NBIIXXVUZAFLBC-UHFFFAOYSA-N
LogP -2.15
CAS DataBase Reference 7664-38-2(CAS DataBase Reference)
NIST Chemistry Reference Phosphoric acid(7664-38-2)
EPA Substance Registry System Phosphoric acid (7664-38-2)

Description and Uses

Phosphoric acid was prepared first by Robert Boyle in 1694 by dissolving phosphorus pentoxide in water. Phosphoric acid is probably the most important compound of phosphorus. It is the second largest inorganic chemical by volume, after sulfuric acid, marketed in the United States.
The single most important application of Phosphoric acid is manufacturing phosphate salts for fertilizers. Such fertilizer phosphates include sodium, calcium, ammonium, and potassium phosphates. Other applications are in metal pickling and surface treatment for removal of metal oxides from metal surfaces; electropolishing of aluminum; as a bonding agent in various refractory products such as alumina and magnesia; as a catalyst in making nylon and gasoline; as a dehydrating agent; in fireproofing wood and fabrics; in lithographic engraving; in textile dyeing; in dental cement; in coagulating rubber latex; in purifying hydrogen peroxide; and as a laboratory reagent. Dilute solutions of phosphoric acid are used as additives to carbonated beverages for a pleasing sour taste. Also, dilute acid is used in refining sugar; as a nutrient; and as a buffering agent in preparing jam, jelly, and antibiotics. The commercial phosphoric acid is 85% (w/w) in strength.

In the manufacture of superphosphates for fertilizers, other phosphate salts, polyphosphates, detergents. Acid catalyst in making ethylene, purifying hydrogen peroxide. As acidulant and flavor, synergistic antioxidant and sequestrant in food. Pharmaceutic aid (solvent). In dental cements; process engraving; rustproofing of metals before painting; coagulating rubber latex; as analytical reagent.

Safety

Symbol(GHS) 
GHS05,GHS07
Signal word  Danger
Hazard statements  H290-H302-H314
Precautionary statements  P234-P270-P280-P301+P312-P303+P361+P353-P305+P351+P338
Hazard Codes  C,Xn,T,F
Risk Statements  34-35-22-39/23/24/25-36/38-23/24/25-11
Safety Statements  7-16-26-36/37-45-36/37/39-1/2-24/25
RIDADR  UN 3453 8/PG 3
OEB C
OEL TWA: 1 mg/m3, STEL: 3 mg/m3
WGK Germany  3
RTECS  TB6300000
3-10
TSCA  Yes
HS Code  2809 20 00
HazardClass  8
PackingGroup  III
Hazardous Substances Data 7664-38-2(Hazardous Substances Data)
Toxicity 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%.
IDLA 1,000 mg/m3

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