Phosphoric acid
Phosphoric acid, also known as orthophosphoric acid (molecular structure H3PO4), is a pure substance that appears as a colorless, transparent, viscous liquid or as orthorhombic crystals. It is odorless and has a very sour taste. An 85% concentration of phosphoric acid manifests as a colorless and transparent, or slightly tinted, viscous liquid.
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Description
Product name：Phosphoric acid
CAS NO.: 7664-38-22
EINECS NO.: 231-633-2
Category: Inorganic acid
Appearance: 85% phosphoric acid is a colorless, transparent, or slightly tinted viscous liquid
Physics property
Melting point: ~40°C(lit.)
Boiling point: 158°C(lit.)
Density: 1.685g/mLat25°C(lit.)
Vapor density: 3.4(vsair)
Vapor pressure: 2.2mmHg(20°C)
FEMA: 2900|PHOSPHORICACID
Refractive index: n20/D1.433
Storage conditions: norestrictions.
Application
Ⅰ. In agriculture, phosphoric acid is a key raw material for the production of essential phosphate fertilizers (such as superphosphate and mono-potassium phosphate) and is also used in the manufacture of feed supplements (such as mono-calcium phosphate).
Ⅱ. In industry, phosphoric acid serves as an important chemical raw material, with primary uses that include:
1. Metal surface treatment, where it generates insoluble phosphate films on metal surfaces to protect them from corrosion.
2. Combination with nitric acid as a chemical polishing agent to enhance the smoothness of metal surfaces.
3. Production of phosphate esters used in detergents and pesticides.
4. Raw material for the production of phosphorus-containing flame retardants.
Ⅲ. In food, phosphoric acid acts as a food additive, serving as an acidulant and yeast nutrient; it is present in colas, for instance. Phosphates are also significant food additives, functioning as nutritional enhancers.
Ⅳ. In medicine, phosphoric acid is used to synthesize phosphorus-containing drugs, such as sodium glycerophosphate.
