Phosphorous acid
General Product Information
| Article | Phosphorous acid |
| Synonyms | Phosphonic acid, Dihydroxyphosphine oxide, Orthophosphorous acid, Metaphosphoroic acid |
| CAS No. | 13598-36-2 |
| EEG No. | 015-157-00-0 |
| EINECS No. | 233-663-1 |
| IMO | Class 8 (a) |
| Tariff Code | 28111980 |
| UN No. | 2834 |
| VLG/ADR | Class 8, Packing Group iii |
Description
Phosphoric acid is an inorganic acid that belongs to the phosphoroxo acids. In industry, it is often supplied as an aqueous solution. It is a colorless, odorless, solid at room temperature, but it dissolves well in water to form an acid-reactive solution. Phosphoric acid is mainly used as a reducing agent and as a raw material for the production of phosphonates and other phosphorus-containing chemicals.
Characteristics
- Odor: Odorless.
- Hygroscopic: Yes.
- Color: Colorless.
- Grade: Technical.
- Solubility: Highly soluble in water.
- Shape: Crystalline powder.
Physical & Chemical Properties
| Chemical Structure | H3PO3 |
| Molar Weight | 82.00 g/mol |
| Melting Point | Approx. 73 °C. |
| Boiling Point | – |
| Density | – |
| Refractive Index | – |
| pH | – |
Applications
Phosphoric acid is applied in various ways, for instance:
1. Chemical Industry
Production of phosphonates and phosphorus-containing compounds, fungicides and additives.
2. Cleaning Agents
Ingredient in industrial cleaning and degreasing agents.
3. Water Treatment
Used as a corrosion inhibitor in water circuits.
4. Metal Industry
Pickling agent and cleaner for surface treatment of metals.
5. Textile Industry
Use as a mordant at the cleaning and preparation of textile fibers.
Interessing Links
- CAS Common Chemistry – Phosphonic acid
- European Chemicals Agency (ECHA) – For chemical information and regulations.
- PubChem – Phosphorous Acid – Chemical information by the National Library of Medicine of the National Center for Biotechnology Information (NIH-NCBI).
- Wikipedia – Phosphorous acid