The Sodium tungstate, dihydrate with CAS registry number of 10213-10-2 is also known as Tungsten, diolatodioxo-, sodium salt, hydrate (1:2:2). The IUPAC name is Disodium dioxido(dioxo)tungsten dihydrate. Its EINECS registry number is 236-743-4. In addition, the formula is H₂O.Na.1/2O₄W and the molecular weight is 164.62. This chemical is a white to slightly yellow crystalline powder and should be stored in cool and dry room.

Physical properties about Sodium tungstate, dihydrate are: (1)#H bond acceptors: 4; (2)#H bond donors: 2; (3)Exact Mass: 329.93126; (4)MonoIsotopic Mass: 329.93126; (5)Topological Polar Surface Area: 82.3; (6)Heavy Atom Count: 9; (7)Covalently-Bonded Unit Count: 5.

Preparation of Sodium tungstate, dihydrate. Firstly, the wolframite is crushed to 320 mesh, and reacts with 30% sodium hydroxide. Then the reaction mixture reacts with calcium chloride, hydrochloric acid and sodium hydroxide by turns to obtain sodium tungstate. At last, product is obtained after evaporation, crystallization, centrifugal dewatering and drying.

(1) MnWO₄·FeWO₄+4NaOH→2NaWO₄+Fe(OH)₂·Mb(OH)₂
(2) NaWO₄+CaCl₂→CaWO₄+2NaCl
(3) CaWO₄+2HCl→CaCl₂+H₂WO₄
(4)H₂WO₄+2NaOH→Na₂WO₄·2H₂O

Uses of Sodium tungstate, dihydrate: it is used for manufacturing tungsten, tungsten acid and tungsten salts. It's also used as mordant, pigment, catalyst, fire retardant fabric, chemical reagent and inhibitor.

When you are using this chemical, please be cautious about it. As a chemical, it is irritating to eyes and skin. Besides, it is harmful if swallowed. During using it, wear suitable protective clothing, gloves and eye/face protection. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
1. Canonical SMILES: O.O.[O-][W](=O)(=O)[O-].[Na+].[Na+]
2. InChI:InChI=1S/2Na.2H2O.4O.W/h;;2*1H2;;;;;/q2*+1;;;;;2*-1;
3. InChIKey: WPZFLQRLSGVIAA-UHFFFAOYSA-N

The toxicity data is as follows: