Phosphorous acid
Also known as: Phosphonic acid, Orthophosphorous acid, Phosphorous(III) acid, Dihydroxyphosphine oxide, Phosphorus trihydroxide, Trihydroxyphosphine
Phosphorous acid (CAS 13598-36-2) is a compound in the Inorganic Chemicals category listed in the Jingsj chemical database. It has the molecular formula H3O3P and a molecular weight of 81.996 g/mol. Key properties include a melting point of 73 °C, a boiling point of 200 °C, a density of 1.651 g/mL at 25 °C(lit.) and a flash point of 200°C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 13598-36-2
- Jingsj CID
- J-19053-8
- Molecular Formula
- H3O3P
- Molecular Weight
- 81.996 g/mol
- Category
- Inorganic Chemicals
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 73 °C |
|---|---|
| Boiling Point | 200 °C |
| Density | 1.651 g/mL at 25 °C(lit.) |
| Flash Point | 200°C |
| Exact Mass | 81.981979 |
| PSA | 81.00000 |
| LogP | -2.47 |
| Additional Property | SOLUBLE |
Customs & Trade Information
| HS Code | 2811199090 |
|---|
Frequently Asked Questions
What is the CAS number of Phosphorous acid?
The CAS number of Phosphorous acid is 13598-36-2.
What are the molecular formula and molecular weight of Phosphorous acid?
Phosphorous acid has molecular formula H3O3P and molecular weight 81.996 g/mol.
What are the upstream and downstream products of Phosphorous acid?
For Phosphorous acid, Upstream Products: 4-Iodoanisole, 2,6-Difluoroiodobenzene, Phosphorus trichloride; Downstream Products: Phosphoric acid, hydrogen sulfide, Ethephon.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Phosphorous acid (CAS 13598-36-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-19053-8 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.