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Phosphoric acid

Phosphoric acid
Phosphoric acid
Chemical Name:
Phosphoric acid
NFB;H3PO4;EVITs;Sonac;Marphos;U.N. 1805;FEMA 2900;PHOS ACID;Phosphoric;wc-reiniger
Molecular Formula:
Formula Weight:
MOL File:

Phosphoric acid Properties

Melting point:
~40 °C(lit.)
Boiling point:
158 °C(lit.)
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
storage temp. 
Store below +30°C.
H2O: soluble
2.1-7.2-12.3(at 25℃)
Solid or Viscous Liquid
<0.5 (100g/l, H2O, 20℃)
Water Solubility 
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)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
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
WGK Germany  3
RTECS  TB6300000
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%.
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H290 May be corrosive to metals Corrosive to Metals Category 1 Warning P234, P390, P404
H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
H318 Causes serious eye damage Serious eye damage/eye irritation Category 1 Danger P280, P305+P351+P338, P310
Precautionary statements:
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P310 Immediately call a POISON CENTER or doctor/physician.
P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.

Phosphoric acid price More Price(50)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 03366 Phosphate atomic spectroscopy standard concentrate 1.00 g PO43- 1.00 g/L, for 1L standard solution, analytical standard 7664-38-2 1ea $31.9 2018-11-13 Buy
Sigma-Aldrich 04107 Phosphoric acid puriss., meets analytical specification of Ph. Eur., BP, NF, FCC, 85.0-88.0% 7664-38-2 6x1l $410 2018-11-13 Buy
Alfa Aesar 033266 Phosphoric acid, 85% w/w aq. soln., ACS 7664-38-2 1kg $41.1 2018-11-16 Buy
Alfa Aesar 033266 Phosphoric acid, 85% w/w aq. soln., ACS 7664-38-2 *4x1kg $111 2018-11-16 Buy
Strem Chemicals 93-1541 Phosphoric acid (ACS), 85% 7664-38-2 1kg $52 2018-11-13 Buy

Phosphoric acid Chemical Properties,Uses,Production


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.

Chemical Properties

Phosphoric acid is a colourless, odourless chemical substance.
Phosphoric acid on combustion forms toxic fumes (phosphorous oxides) and decomposes on contact with alcohols, aldehydes, cyanides, ketones, phenols, esters, sulphides, and halogenated organics producing toxic fumes. It violently polymerises under the influence of azo compounds and epoxides attacks many metals forming flammable/explosive gas. Phosphoric acid violently polymerises under the influence of azo compounds and epoxides, reacting violently with bases. It has wide-scale application in industries, in the manufacture of superphosphates for fertilisers, phosphate salts, polyphosphates, and detergents, as a catalyst in ethylene manufacture and hydrogen peroxide purification as a flavour, acidulant, synergistic anti-oxidant, and sequestrant in food. In dental cements, in process engraving, metal rustproofing, latex coagulation, analytical reagent, and as a veterinary product in the treatment of lead poisoning. Food-grade phosphoric acid is used to acidify foods and beverages. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. Phosphoric acid, used in many soft drinks, has been linked to lower bone density in epidemiological studies. In brief, phosphoric acid is a strong acid and common industrial chemical used in the manufacture of a wide number of products, notably porcelain and metal cleaners, detergents, and fertilisers. It is also used as a food additive and is a major constituent of many soft drinks. Low phosphate concentrations are found in drinking water to which it is added in some areas in order to reduce lead solubility.

Chemical Properties

Phosphoric acid is a colorless, odorless, crystalline solid or a thick syrupy liquid. Physical state is strength and temperature dependent.


phosphoric acid is a preservative and an anti-oxidant. It is irritating to the skin in concentrated solutions.


Phosphoric Acid is an acidulant that is an inorganic acid produced by burning phosphorus in an excess of air, producing phosphorus pentoxide which is dissolved in water to form orthophosphoric acid of varying concentrations. it is a strong acid which is soluble in water. the acid salts are termed phosphates. it is used as a flavoring acid in cola and root beer beverages to provide desirable acidity and sourness. it is used as a synergistic antioxidant in vegetable shorten- ings. in yeast manufacture, it is used to maintain the acidic ph and provide a source for phosphorus. it also functions as an acidulant in cheese. it is also termed orthophosphoric acid.


Phosphorous acid is used for reaction with inorganic and organic products, for water treatment, industrial and agricultural uses. It is also used to bleach industrial and cleaning supplies. Contact


ChEBI: A phosphorus oxoacid that consits of one oxo and three hydroxy groups joined covalently to a central phosphorus atom.


Low-purity technical grade phosphoric acid for use in fertilizers is produced from phosphate rocks by digestion with concentrated sulfuric acid. The apatite types, primarily consisting of calcium phosphate phosphate rocks, are used: Ca3(PO4)2 + 3H2SO4 + 6H2O → 2H3PO4 + 3(CaSO4•2H2O)
The insoluble calcium sulfate slurry is filtered out. Acid from this wet process is impure but can be purified by various methods. Purification steps involve precipitation, solvent extraction, crystallization, and ion exchange techniques.
Phosphoric acid also can be made by many different methods. Dissolution of phosphorus pentoxide in water and boiling yields phosphoric acid. Pure phosphoric acid can be obtained by burning phosphorus in a mixture of air and steam:
P4 (l) + 5O2 (g) →P4O10 (s)
P4O10 (s) + H2O (g) → 4H3PO4 (l)
The acid also may be prepared by heating violet phosphorus with 33% nitric acid:
4P + 10HNO3 + H2O → 4H3PO4 + 5NO ↑ + 5NO2 ↑
or by heating red phosphorus with nitric acid (1:1). The overall equation is:
P + 3HNO3 → H3PO4 + NO + 2NO2


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.

brand name

Pharmaceutic aid (solvent).

General Description

A clear colorless liquid or transparent crystalline solid. The pure solid melts at 42.35°C and has a density of 1.834 g / cm3. Liquid is usually an 85% aqueous solution. Shipped as both a solid and liquid. Corrosive to metals and tissue. Used in making fertilizers and detergents and in food processing.

Air & Water Reactions

Soluble in water with small release of heat.

Reactivity Profile

Phosphorous 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].

Health Hazard

Burns on mouth and lips, sour acrid taste, severe gastrointestinal irritation, nausea, vomiting, bloody diarrhea, difficult swallowing, severe abdominal pains, thirst, acidemia, difficult breathing, convulsions, collapse, shock, death.

Fire Hazard

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.

Safety Profile

Human poison by ingestion. Moderately toxic by skin contact. A corrosive irritant to eyes, skin, and mucous membranes, and a systemic irritant by inhalation. A common air contaminant. A strong acid. Mixtures with nitromethane are explosive. Reacts with chlorides + stainless steel to form explosive hydrogen gas. Potentially violent reaction with solum tetrahydroborate. Dangerous; when heated to decomposition it emits toxic fumes of POx

Potential Exposure

Phosphoric acid is used in the manufacture of fertilizers, phosphate salts; polyphosphates, detergents, activated carbon; animal feed; ceramics, dental cement; pharmaceuticals, soft drinks; gelatin, rust inhibitors; wax, and rubber latex. Exposure may also occur during electropolishing, engraving, photoengraving, lithographing, metal cleaning; sugar refining; and water-treating.

First aid

Move victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. Medical observation is recommended for 2448 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.


UN1805 Phosphoric acid solution, Hazard class: 8; Labels: 8-Corrosive material. UN3543 Phosphoric acid solid, Hazard class: 8; Labels: 8-Corrosive material.


The substance is a medium strong acid. Incompatible with strong caustics; most metals. Readily attacks and reacts with metals forming flammable hydrogen gas. Do not mix with solutions containing bleach or ammonia. Violently polymerizes on contact with azo compounds; epoxides, and other polymerizable compounds. Decomposes on contact with metals, alcohols, aldehydes, cyanides, ketones, phenols, esters, sulfides, halogenated organics; producing toxic fumes. Corrosive to common metals and possibly to some rubbers and plastics.

Waste Disposal

Add slowly to solution of soda ash and slaked lime with stirring, then flush to sewer with large volumes of water.

Phosphoric acid Preparation Products And Raw materials

Raw materials

Preparation Products

Phosphoric acid Suppliers

Global( 397)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Hebei Guanlang Biotechnology Co., Ltd.
+86-0311-66562153 whatsapp +8615203118427
+86-0311-66562153 CHINA 417 50
Hangzhou Bayee Chemical Co., Ltd.
0086-571-86990109; 0086-18605816692
0086-571-85775919 China 99 55
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20795 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32764 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 1582 55
career henan chemical co
+86-371-86658258 CHINA 20001 58
Shanghai Macklin Biochemical Co.,Ltd. 15221275939
021-51821727 China 15835 55
Shanghai Aladdin Bio-Chem Technology Co.,LTD 021-20337333/400-620-6333
021-50323701 China 25127 65
Shanghai neon biological technology co., LTD 021-54252912-8903 China 4821 58
Jiangsu Bohan Industry and Trade Co., Ltd. 13605157325 CHINA 11 58

View Lastest Price from Phosphoric acid manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-19 Phosphoric acid
US $1.00 / kg 1kg AR,85 wt. % in H2O 1000kg career henan chemical co
2018-08-09 Phosphoric acid
US $10.00 / KG 10G 99% 10MT per month Hebei Guanlang Biotechnology Co., Ltd.

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