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Product Details
Phosphoric acid, also known as orthophosphoric acid (chemical formula HPO), exists as a colorless, viscous liquid or orthorhombic crystalline solid in its pure form. It is odorless with a distinctly sour taste. The commercially available 85% phosphoric acid solution appears as a clear or slightly tinted, syrupy liquid. This compound has a melting point of 42.35C and a specific gravity of 1.70. As a high-boiling-point acid, it mixes completely with water in all proportions. When heated to 213C, it begins to lose water molecules, forming pyrophosphoric acid, and further heating to 300C converts it into metaphosphoric acid. With a relative density of 1.834, it readily dissolves in both water and ethanol.
As a typical inorganic acid of moderate strength, phosphoric acid exhibits weaker acidity than strong mineral acids like sulfuric, hydrochloric, and nitric acids, but demonstrates stronger acidic properties compared to weak acids such as acetic, boric, and carbonic acids. Its reaction with sodium carbonate yields different phosphate salts depending on the pH conditions. The acid can cause skin irritation and tissue damage upon contact. Concentrated phosphoric acid becomes corrosive when heated in porcelain containers. Due to its hygroscopic nature, proper storage requires airtight containers.
Commercial phosphoric acid typically consists of a thick solution containing approximately 82% HPO. The solution's high viscosity results from extensive hydrogen bonding between its molecules.
Chemical Formula: HPO CAS: 7664-38-2
A colorless, odorless, viscous liquid or crystalline solid with a sour taste. Commercial 85% solution exhibits syrup-like viscosity due to hydrogen-bonded networks.
Advanced Physicochemical Properties
Parameter
Value
Melting Point
42.35C (pure)
Boiling Point
158C (decomp.)
Density (25C)
1.834 g/cm (pure)
Viscosity (85%, 25C)
147 cP
pKa Values
pKa=2.14, pKa=7.20, pKa=12.67
Refractive Index (85%)
1.342
Thermal Decomposition
Pyrophosphoric (213C) Metaphosphoric (300C)
Industrial Applications
1. Food Industry
Acidulant: pH control in soft drinks (0.05-0.1%)
Emulsifier: Processed cheese (0.2-0.4%)
Sanitizer: 10-15% solution for dairy equipment
2. Agriculture
Fertilizer Precursor: Reacts with phosphate rock superphosphates
Ca5(PO4)3F+5H2SO4+10H2O3H3PO4+5CaSO42H2O+HFCaX5(POX4)X3F+5HX2SOX4+10HX2O3HX3POX4+5CaSOX42HX2O+HF
3. Metal Processing
Pickling Agent: 15-25% solution removes rust (forms protective iron phosphate layer)
Passivation: Phosphating coatings for automotive bodies
4. Electronics
Etchant: 85% solution for SiNx removal (selectivity >100:1 vs SiO)
Electrolyte: Fuel cells (150C operation)
5. Chemical Synthesis
Catalyst: Ethylene oligomerization (Homogeneous process)
Dehydrating Agent: Cyclization reactions
Additional Information:
Payment Terms : L/C, D/A, D/P, T/T, Western Union,
Packaging Details : clients request
Delivery Time : prompt
ARJUN JI (Neet Preservatives)
91 Zone Phulbani town Kandhamal District, Odisha - 762001, India
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