Phosphoric Acid
CAS 7664-38-2
| Product name | Phosphoric Acid |
|---|---|
| Synonyms | orthophosphoric acid, H3PO4, food grade phosphoric acid |
| C.A.S. number | 7664-38-2 |
| Molecular formula | H3PO4 |
| Molecular weight | 98.00 g/mol |
| Grade supplied against | 85% technical & food grade |
| Appearance | Clear, colourless, odourless, syrupy viscous liquid; technical grade may be pale straw or faintly green-tinged |
| Product group | Mineral & Organic Acids |
| HSN code | 2809 20 10 |
| Country of origin | As stated on the producer’s documents for the lot supplied; confirmed at offer stage |
| Packing | Road tanker · 330 kg drum |
| Storage | Store above 20 C (Chem-Lab SDS) in a well-ventilated area, because 85% acid crystallises at about 21 C — heated or insulated storage, or trace heating, is normal. Use 316L stainless steel, HDPE, PE- or rubber-lined steel, FRP or glass. Keep containers tightly closed and away from strong bases, reactive metals, oxidisers, azo compounds and epoxides, and from food and feedstuffs. Bund the area and provide eyewash and safety shower. |
| S. No. | Test parameter | Specification | Method |
|---|---|---|---|
| 1 | Description | Clear, colourless, odourless, syrupy viscous liquid; technical grade may be pale straw or faintly green-tinged | Visual |
| 2 | Identification | Conforms to the substance supplied | Instrumental or chemical test, per method agreed |
| 3 | Assay / grade | 85% technical & food grade | Titrimetry or instrumental, per method agreed |
| 4 | Physical state | Liquid (viscous). Note that 85% acid crystallises to a solid at about 21 C | Visual |
| 5 | Solubility in water | Miscible with water in all proportions; also soluble in ethanol | Per the test method agreed |
| 6 | pH | 1.5 (0.1 N aqueous solution — Alliance Chemical SDS); <1 as supplied at 85% | Potentiometry on an aqueous suspension |
| 7 | Relative density | 1.685-1.692 g/cm3 at 20 C for 85% technical grade (Alliance Chemical SDS); Chem-Lab quotes 1.71 g/mL for 85% a.r. | Pyknometry or gas displacement |
| 8 | Melting / freezing point | 21 C — crystallisation point of the 85% acid (Alliance Chemical and Chem-Lab SDS). Pure anhydrous H3PO4 melts at 42 C (ILO ICSC 1008) | Thermal analysis |
| 9 | Boiling point | 158 C for the 85% acid (Alliance Chemical and Chem-Lab SDS). ILO ICSC 1008 notes that the pure acid decomposes at 213 C | Distillation range |
| 10 | Flash point | Not flammable (not applicable). Caution: attacks many metals with evolution of flammable hydrogen gas | Not applicable — the substance is not combustible |
| 11 | Additional parameters | To the specification agreed before order | As agreed |
UN 1805 · Class 8 (Corrosive) · Packing group III
Proper shipping name: PHOSPHORIC ACID SOLUTION
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