The IUPAC name of Sodium phosphite is sodium phosphonate pentahydrate. With the CAS registry number 13708-85-5, it is also named as Phosphonic acid, disodium salt. The product's category is Inorganics, and the other registry numbers are 130184-07-5; 16926-95-7; 448193-21-3. Besides, it is colorless monoclinic or orthorhombic crystals, which is toxic along with all phosphites. In addition, its molecular formula is HNa₂O₃P and molecular weight is 125.96.

The other characteristics of Sodium phosphite can be summarized as: (1)Nominal mass: 126 Da; (2)Average mass: 125.9594 Da; (3)Monoisotopic mass: 125.94587 Da; (4)#H bond acceptors: 3; (5)#H bond donors: 2; (6)#Freely Rotating Bonds: 0; (7)Polar Surface Area: 86.66 Å²; (8)EINECS: 237-249-1.

Production of Sodium phosphite: frist, use NaOH (or Na₂CO₃) to react with H₃PO₄. And then control the temperature after the concentration. At last, you would obtain this chemical by crystallization and recrystallization.

People can use the following data to convert to the molecule structure.
(1)SMILES: [Na+].[Na+].[O-]P([O-])=O
(2)InChI: InChI=1/2Na.H3O3P/c;;1-4(2)3/h;;4H,(H2,1,2,3)/q2*+1;/p-2
(3)InChIKey: YPPQYORGOMWNMX-NUQVWONBAU
(4)Std. InChI: InChI=1S/2Na.H3O3P/c;;1-4(2)3/h;;4H,(H2,1,2,3)/q2*+1;/p-2
(5)Std. InChIKey: YPPQYORGOMWNMX-UHFFFAOYSA-L