Phosphoric acid
Phosphoric acid
CAS: 7664-38-2
Molecular Formula: H3PO4
Phosphoric acid - Names and Identifiers
| Name | Phosphoric acid |
| Synonyms | Phosphoric acid orthophosphoric acid Anhydrous phosphoric acid PHOSPHORIC ACID TECH.GRADE |
| CAS | 7664-38-2 |
| EINECS | 231-633-2 |
| InChI | InChI=1/H3O4P/c1-5(2,3)4/h(H3,1,2,3,4) |
Phosphoric acid - Physico-chemical Properties
| Molecular Formula | H3PO4 |
| Molar Mass | 97.99 |
| Density | 1.685 |
| Melting Point | 21℃ |
| Boling Point | 158℃ |
| Water Solubility | MISCIBLE |
| Physical and Chemical Properties | appearance and properties: colorless transparent or slightly light color thick liquid, pure phosphoric acid for colorless crystals, odorless, with a sour taste. relative density 1.70 |
| Use | Mainly used in phosphate industry, electroplating, polishing industry, sugar industry, compound fertilizer, etc. In the food industry as a sour agent, yeast nutrition agent |
Phosphoric acid - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R34 - Causes burns |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 1805 |
Phosphoric acid - Upstream Downstream Industry
Phosphoric acid - Nature
Open Data Verified Data
transparent colorless viscous solution, odorless. General content of 85% ~ 95%. Continue to concentrate to obtain colorless columnar crystals, density (18 deg C) 1.834g/cm3, melting point 42.3 deg C, boiling point 158 deg C, freezing point 21.1 deg C. It was heated to 150 ° C. And changed to pyrophosphoric acid and to metaphosphoric acid at about 215 ° C., with a vapor pressure of 300. Strong deliquescence. Miscible with water and ethanol.
Last Update：2025-06-10 22:55:16
Phosphoric acid - Preparation Method
Open Data Verified Data
After gasification, the yellow phosphorus is introduced into air or superheated water vapor to oxidize it to generate phosphorus pentoxide, which is obtained by absorption and purification with water. Alternatively, nitric acid is used to oxidize phosphorus. Can also make tricalcium phosphate and dilute sulfuric acid co-heating, after decomposition, filter out the filtrate, and then concentrated to prepare.
Last Update：2025-06-10 22:55:16
Phosphoric acid - Standard
Authoritative Data Verified Data
This product containing H3P04 should be 85.0% ~ 90.0%(g/g).
Last Update：2024-01-02 23:10:35
Phosphoric acid - Trait
Authoritative Data Verified Data
- This product is colorless, transparent viscous liquid; Corrosive; Miscible with water or ethanol.
- relative density the relative density of this product (General 0601) is about 1.7.
Last Update：2022-01-01 11:28:45
Phosphoric acid - Application
Open Data Verified Data
phosphoric acid is mainly used in the field of water treatment as a water softener, a scale cleaning agent, and a raw material for producing a phosphorus-based water treatment agent. There are many other uses of phosphoric acid, high purity phosphoric acid can be used in the production of fluoride-free feed; Used as a polishing agent in the electroplating industry; Used as a detergent in the printing industry. Ethylene synthesis and purification of hydrogen peroxide during the cycle as an acidulant; Beverage production as an acidulant and flavoring agent; Dye industry as a desiccant. Textile printing and dyeing industry as a printing and dyeing mordant, silk gloss agent; Daily chemical industry as a detergent additive, for the production of safety matches; Sugar industry as a clarifier; Analytical chemistry as Analytical reagents.
Last Update：2025-08-19 16:24:40
Phosphoric acid - Differential diagnosis
Authoritative Data Verified Data
The product of phosphate identification reaction (General 0301).
Last Update：2022-01-01 11:28:45
Phosphoric acid - Safety
Open Data Verified Data
a concentrated solution of phosphoric acid is irritating to the skin and eyes and can corrode the skin to cause inflammation. Phosphoric acid vapor can cause nasal mucosa atrophy, can cause systemic poisoning. The maximum allowable concentration of phosphoric acid in air is 1 mg/ma. If not, the skin contact with phosphoric acid, should immediately rinse with plenty of water, and wipe red mercury solution or gentian violet solution, poisoning phenomenon should be sent to the hospital immediately. It is not allowed to be stored and mixed with alkaline, toxic and corrosive substances.
Last Update：2025-06-10 22:55:16
Phosphoric acid - Exam
Authoritative Data Verified Data
clarity and color of solution
take this product l.Og, add water 15ml shake, check according to law (General rule 0901 and general rule 0902), the solution should be clear and colorless.
ammonia precipitate
take l.Og of this product, add 15ml water, add 12ml ammonia test solution, the solution should be no turbidity.
hypophosphorous and phosphorous acid
take l.Og of this product, add 15ml of water, add 6ml of silver nitrate test solution, water bath heating for 5 minutes, the solution should be no turbidity.
alkaline phosphate
take this product lml, add ether 6ml and ethanol 2ml, the solution should be no turbidity.
nitrate
take 2.6g of this product, add 3.5 of water, add 0.1ml of indigo carmine test solution and 5ml of sulfuric acid in turn, and the blue color of the solution will not disappear within 1 minute.
chloride
take 2.0g of this product and check it according to law (General rule 0801). Compared with the control solution made of 0.005% ml of standard sodium chloride solution, it should not be more concentrated ().
sulfate
take this product 2.0g, check according to law (General rule 0802), and the standard potassium sulfate solution 2.Oml made of the control solution, should not be more concentrated (0.01%).
Iron Salt
take this product 3.0G, add water 30ml, shake, take 0807, check according to law (general rule), and standard iron solution 1.0ml of the control solution should not be deeper (0.005%).
Heavy metals
take 1.Og of this product, add 1.6 of ammonia test solution, dilute it to 0821 with water, and check it according to law (general rule, law 1). The heavy metal content shall not exceed 10 parts per million.
arsenic salt
take this product l.O g, add hydrochloric acid 5ml and water 22ml, check according to law (General Principles 0822 The first law), should comply with the provisions (0.0002%).
Last Update：2022-01-01 11:28:46
Phosphoric acid - Content determination
Authoritative Data Verified Data
take this product about l.Og, precision weighing, add water 120ml, add thymol phthalein indicator solution 0.5ml, with sodium hydroxide titration solution (lmol/L) titration. Each 1 ml of sodium hydroxide titration solution (1 mol/L) corresponds to 49.00 mg of H3PO4.
Last Update：2022-01-01 11:28:47
Phosphoric acid - Category
Authoritative Data Verified Data
pharmaceutical excipients, pH regulator.
Last Update：2022-01-01 11:28:47
Phosphoric acid - Storage
Authoritative Data Verified Data
sealed storage.
Last Update：2022-01-01 11:28:47
Phosphoric acid - Introduction
Phosphoric acid is an inorganic compound with the chemical formula H3PO4. It appears as colorless, transparent crystals and is easily soluble in water. Phosphoric acid is acidic and can react with metals to produce hydrogen gas, as well as react with alcohols to form phosphate esters.
Phosphoric acid is widely used in various industries, including as a raw material for the production of fertilizers, cleaning agents, and food additives. It is also used in the manufacture of phosphate salts, pharmaceuticals, and in chemical processes. In biochemistry, phosphoric acid is an important component of cells, participating in energy metabolism and DNA synthesis, among other biological processes.
The production of phosphoric acid typically involves wet and dry processes. The wet process involves heating phosphate rock (such as apatite or phosphorite) with sulfuric acid to produce phosphoric acid, while the dry process involves the calcination of phosphate rock followed by wet extraction and reaction with sulfuric acid.
In industrial production and use, phosphoric acid poses certain safety risks. Highly concentrated phosphoric acid is strongly corrosive and can cause irritation and damage to the skin and respiratory tract. Therefore, proper protective measures should be taken to avoid skin contact and inhalation of its vapors when handling phosphoric acid. Moreover, phosphoric acid also poses environmental risks, as excessive discharge can lead to water and soil pollution. Hence, strict control and proper waste disposal practices are essential during production and use.
Last Update：2024-04-09 21:50:46
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Raw Materials for Phosphoric acid
Downstream Products for Phosphoric acid