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Sodium tungstate dihydrate

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Sodium tungstate dihydrate Basic information

Product Name:
Sodium tungstate dihydrate
Synonyms:
  • SODIUM TUNGSTATE 2H2O
  • SODIUM TUNGSTATE-2-HYDRATE
  • SODIUM TUNGSTATE DIHYDRATE
  • SODIUM TUNGSTATE HYDRATED
  • SODIUM TUNGSTATE(VI) DIHYDRATE
  • TUNGSTIC ACID NA-SALT 2H2O
  • TUNGSTIC ACID SODIUM SALT DIHYDRATE
  • Tungsticaciddisodiumsaltdihydrate
CAS:
10213-10-2
MF:
H2NaO5W-
MW:
288.84
EINECS:
600-275-2
Product Categories:
  • metal tungstate
Mol File:
10213-10-2.mol
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Sodium tungstate dihydrate Chemical Properties

Melting point:
698 °C(lit.)
Density 
4.18
storage temp. 
Store at +15°C to +25°C.
solubility 
H2O: 1 M at 20 °C, clear, colorless
form 
Solid
color 
White to slightly yellow
Specific Gravity
3.25
Odor
Odorless
PH Range
9 - 11.5 at 100 g/l at 20 °C
PH
9.5-11.5 (25℃, 1M in H2O)
Water Solubility 
730 g/L (20 ºC)
λmax
λ: 260 nm Amax: ≤0.120
λ: 280 nm Amax: ≤0.035
Merck 
14,8698
Exposure limits
ACGIH: TWA 3 mg/m3
NIOSH: TWA 1 mg/m3; STEL 3 mg/m3
InChIKey
WPZFLQRLSGVIAA-UHFFFAOYSA-N
CAS DataBase Reference
10213-10-2(CAS DataBase Reference)
EPA Substance Registry System
Tungstate (WO42-), disodium, dihydrate, (T-4)- (10213-10-2)
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Safety Information

Hazard Codes 
Xn
Risk Statements 
22-36/38-36
Safety Statements 
36-37/39-26-39
WGK Germany 
1
RTECS 
YO7900000
TSCA 
Yes
HS Code 
28418000
Toxicity
LD50 (mg tungstate/kg) in rabbits: 105 i.m.; in rats: 240 s.c. (Venugopal, Luckey)

MSDS

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Sodium tungstate dihydrate Usage And Synthesis

Chemical Properties

white to slightly yellow crystalline powder or

Uses

Sodium tungstate dihydrate is currently being investigated as a potential therapy for obesity. Sodium tungstate dihydrate is also an inhibitor of acid phosphatases.

Uses

Sodium tungstate dihydrate may be used in the preparation of aqueous sols of tungsten oxide dihydrate.

Uses

Fireproofing and waterproofing fabrics; preparing complex Compounds such as phosphotungstate and silicotungstate; as a protective colloid in biological development methods; precipitant for alkaloids; catalyst in oxidation reactions; corrosion inhibitor for steel.

Definition

ChEBI: A hydrate that is the dihydrate form of sodium tungstate. Combines with hydrogen peroxide for the oxidation of secondary amines to nitrones

General Description

Sodium tungstate dihydrate is a sodium salt of tungstic acid, which occurs as white colorless crystals.

Purification Methods

The salt crystallises from hot water (0.8mL/g) on cooling to 0o. [Grüttner & Jender in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p 1727 1965].

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