Methylarsonic acid
Also known as: Methanearsonic acid, Arsonic acid, methyl-, MAA, Monomethylarsonic acid, Methylarsenic acid
Methylarsonic acid (CAS 124-58-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula CH5AsO3 and a molecular weight of 139.97000 g/mol. Key properties include a melting point of 161ºC, a boiling point of 393.3ºC at 760mmHg and a flash point of 205.8ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 124-58-3
- Jingsj CID
- J-954-1
- Molecular Formula
- CH5AsO3
- Molecular Weight
- 139.97000 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 161ºC |
|---|---|
| Boiling Point | 393.3ºC at 760mmHg |
| Flash Point | 205.8ºC |
| Exact Mass | 139.94500 |
| PSA | 57.53000 |
Frequently Asked Questions
What is the CAS number of Methylarsonic acid?
The CAS number of Methylarsonic acid is 124-58-3.
What are the molecular formula and molecular weight of Methylarsonic acid?
Methylarsonic acid has molecular formula CH5AsO3 and molecular weight 139.97000 g/mol.
What are the upstream and downstream products of Methylarsonic acid?
For Methylarsonic acid, Upstream Products: iodomethane, Chloromethane, Dimethylarsinic acid; Downstream Products: 6-Methyl-5-hepten-2-one, Dimethylarsinic acid, Carbon dioxide.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Methylarsonic acid (CAS 124-58-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-954-1 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.