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Basic Information

Molecular Structure:
CAS No.:	10213-10-2
Name:	Sodium tungstate dihydrate
Article Data:	8

Formula:	H₂O.Na.1/2O₄W
Molecular Weight:	329.858
Synonyms:	Tungsticacid (H₂WO₄), disodium salt, dihydrate (8CI);Disodium tungstate (Na₂WO₄)dihydrate;Sodium tungstate (Na₂WO₄.2H₂O);Sodium tungstate dehydrate;
EINECS:	236-743-4
Density:	4.18 g/cm³
Melting Point:	698 °C
Solubility:	Water: 730 g/L (20 °C)
Appearance:	White to slightly yellow crystalline powder
Hazard Symbols:	Xn
Risk Codes:	22-36/38
Safety:	36-37/39-26
PSA:	98.72000
LogP:	-0.60380

Synthetic route

: tungsten(VI) oxide

: 1310-73-2
sodium hydroxide

: 10213-10-2
sodium tungstate (VI) dihydrate

Conditions

Conditions	Yield
In acetic acid heating, filtration; evapn., crystn.;
In acetic acid heating, filtration; evapn., crystn.;

: tungsten(VI) oxide

: 497-19-8
sodium carbonate

: 10213-10-2
sodium tungstate (VI) dihydrate

Conditions

Conditions	Yield
In not given heating, filtration; evapn., crystn.;
In not given heating, filtration; evapn., crystn.;

: ortho-tungstic acid

: 1310-73-2
sodium hydroxide

: 10213-10-2
sodium tungstate (VI) dihydrate

Conditions

Conditions	Yield
In not given heating, filtration; evapn., crystn.;
In not given heating, filtration; evapn., crystn.;
In water for 0.333333h;

: 497-19-8
sodium carbonate

: ortho-tungstic acid

: 10213-10-2
sodium tungstate (VI) dihydrate

Conditions

Conditions	Yield
In not given heating, filtration; evapn., crystn.;
In melt leaching with boiling water, analogous react. with tungstenic ore; crystn.;
In not given heating, filtration; evapn., crystn.;
In melt leaching with boiling water, analogous react. with tungstenic ore; crystn.;

: sodium tungstate decahydrate

: 10213-10-2
sodium tungstate (VI) dihydrate

Conditions

Conditions	Yield
above 6°C;
above 6°C;

: 10213-10-2
sodium tungstate (VI) dihydrate

: lead(II) nitrate

: lead(II) tungstate

Conditions

Conditions	Yield
In water equiv. amt. of Pb(NO3)2 and Na2WO4*2H2O dissolved in H2O are simultaneously added to H2O at equal flow rates (180 ml/min) with vigorous stirring(stirring rate 210 rpm); soln. decanted; filtered; ppt. washed (H2O); dried at 150°C;	99.8%
In water equiv. amt. of Pb(NO3)2 and Na2WO4*2H2O dissolved in H2O are simultaneously added to H2O at equal flow rates (15 ml/min) with vigorous stirring (stirring rate 300 rpm); soln. decanted; filtered; ppt. washed (H2O); dried at 150°C;	99.5%
In water equiv. amt. of Pb(NO3)2 and Na2WO4*2H2O dissolved in H2O are simultaneously added to H2O at equal flow rates (17 ml/min) with vigorous stirring (stirring rate 300 rpm); soln. decanted; filtered; ppt. washed (H2O); dried at 150°C;	99.7%

: 10213-10-2
sodium tungstate (VI) dihydrate

: disodium phosphate heptahydrate

: 83721-04-4
(tetrabutylammonium)4H3PW11O39

Conditions

Conditions	Yield
With hydrogenchloride In water stirring (1 h, room temp.); washing (water and diethyl ether), drying (vac., 60°C); elem. anal.;	99%

: 5470-70-2
Methyl 6-methylnicotinate

: 10213-10-2
sodium tungstate (VI) dihydrate

: 49668-89-5
5-(methoxycarbonyl)-2-methylpyridine 1-oxide

Conditions

Conditions	Yield
With dihydrogen peroxide In methanol; water	98%

: 10213-10-2
sodium tungstate (VI) dihydrate

: 2-nitrophenylphenyl sulfide

: 2-nitrophenylphenyl sulfone

Conditions

Conditions	Yield
With dihydrogen peroxide; tetra(n-butyl)ammonium hydrogen sulfate In toluene	97.8%

: 10213-10-2
sodium tungstate (VI) dihydrate

: 2-nitrophenylphenyl sulfide

: 56-93-9
benzyltrimethylammonium chloride

: 2-nitrophenylphenyl sulfone

Conditions

Conditions	Yield
With sulfuric acid; dihydrogen peroxide In toluene	97.6%

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Standards and Recommendations

ACGIH TLV: TWA 5 mg(W)/m³; STEL 10 mg(W)/m³
NIOSH REL: (Tungsten) TWA 1 mg(W)/m³

Specification

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:

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Effect	Source
mouse	LD50	intraperitoneal	145mg/kg (145mg/kg)	BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) BEHAVIORAL: COMA	Archives Internationales de Pharmacodynamie et de Therapie. Vol. 154, Pg. 243, 1965.
rat	LD50	intraperitoneal	204mg/kg (204mg/kg)	BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) BEHAVIORAL: COMA	Archives Internationales de Pharmacodynamie et de Therapie. Vol. 154, Pg. 243, 1965.
rat	LD50	subcutaneous	251mg/kg (251mg/kg)		American Journal of the Medical Sciences. Vol. 199, Pg. 668, 1940.