Tungstic acid (H2WO4)
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Tungstic acid (H2WO4)
structure -
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CAS No:
7783-03-1
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Formula:
H.1/2O4W
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Chemical Name:
Tungstic acid (H2WO4)
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Synonyms:
Tungstate (WO42-),hydrogen (1:2),(T-4)-;Tungstic acid (H2WO4);Tungstate (WO42-),dihydrogen,(T-4)-;Tungstic(VI) acid;Tungstic acid;Dihydrogen tetraoxotungstate(2-);dihydrogen tungstate (H2WO4);Tungsten hydroxide oxide (W(OH)2O2);Tungsten acid (H2WO4);Tungsten hydroxide oxide (W(OH)2O2),(T-4)-;Tungsten hydroxide oxide (W(OH)2O2);12196-81-5;36730-36-6;38413-99-9;79702-55-9;82351-38-0;198830-56-7;405262-46-6;449187-63-7;876012-66-7;944379-40-2;1310914-21-6;1446396-04-8;2263918-07-4
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CAS No:
Description
light yellow powder
DryPowder
Tungstic acid is a tungsten coordination entity. It is a conjugate acid of a hydrogentungstate.
Characteristics
74.60000
-0.59120
Yellow to yellow-greenish powder
5.5 g/mL at 25 °C(lit.)
100°C(dec.)
1473°C
1473°C
2.24
H2O: insoluble
Safety Information
NONH for all modes of transport
3
36/37/38
24/25
YO7840000
Stable. Incompatible with strong oxidizing agents.
P261, P264, P271, P280, P304+P340, P305+P351+P338, P312, P337+P313, P403+P233, P405, P501
H319
|Warning|H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]|P261, P264, P271, P280, P304+P340, P305+P351+P338, P312, P337+P313, P403+P233, P405, and P501|Aggregated GHS information provided by 134 companies from 6 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Tungstic acid (H2WO4) Use and Manufacturing
The calcium tungstate-hydrochloric acid decomposition method pulverizes wolframite and reacts with sodium hydroxide to produce sodium tungstate. The solution is filtered, purified, and then metathesized with calcium chloride solution to obtain calcium tungstate, which is then treated with hydrochloric acid. The generated tungstic acid is washed, dried and pulverized to obtain a finished product of tungstic acid. After alkaline hydrolysis of wolframite and sodium hydroxide by ammonium paratungstate-hydrochloric acid decomposition method, it is reacted with hydrochloric acid and ammonium chloride solution, filtered and washed to obtain refined ammonium tungstate solution, and then hydrolyzed with hydrochloric acid to obtain tungstic acid. Dehydrate, dry, and pulverize to obtain tungstic acid products.
Mainly used to make metal tungsten, tungsten wire, cemented carbide, tungstate, and also used as printing and dyeing auxiliary; textile industry mordant, also used in the preparation of tungsten, tungsten wire; mainly used to make metal tungsten, Tungsten wire, tungstate, cemented carbide, etc. Also used as petrochemical catalyst, printing and dyeing auxiliary and lubricant.
Intermediates
May be used in personal care items/biocide products.
25,000 - 100,000 lb
Pesticide, fertilizer, and other agricultural chemical manufacturing|Tungstate (WO42-), hydrogen (1:2), (T-4)-: ACTIVE
Computed Properties
Molecular Weight:249.85
Hydrogen Bond Donor Count:2
Hydrogen Bond Acceptor Count:4
Exact Mass:249.946242
Monoisotopic Mass:249.946242
Topological Polar Surface Area:74.6
Heavy Atom Count:5
Complexity:81.3
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes
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