WordNet

a salt of tungstic acid
street name for lysergic acid diethylamide (同)back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen
any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
having the characteristics of an acid; "an acid reaction"

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酸性の / 酸味のある,すっぱい(sour) / (言葉・態度などが)厳しい,しんらつな / 酸 / すっぱいもの / 《俗》=LSD

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/09/29 09:32:43」(JST)

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Tungstic acid refers to hydrated forms of tungsten trioxide, WO₃. The simplest form, the monohydrate, is WO₃·H₂O, the dihydrate WO₃·2H₂O is also known. The solid state structure of WO₃·H₂O consists of layers of octahedrally coordinated WO₅(H₂O) units where 4 vertices are shared.^[1] the dihydrate has the same layer structure with the extra H₂O molecule intercalated between the layers.^[1] The monohydrate is a yellow solid and insoluble in water. The classical name for this acid is 'acid of wolfram'.

The acid was discovered for the first time by Carl Wilhelm Scheele in 1781.

Preparation

Tungstic acid is obtained by the action of strong acids on solutions of alkali metallic tungstates. It may also be prepared from the reaction between hydrogen carbonate and sodium tungstate.

Uses

It is used as a mordant and a dye in textiles.

References

^ ^a ^b Wells, A.F. (1986). Structural inorganic chemistry (5th ed. ed.). Oxford [Oxfordshire]: Clarendon Press. ISBN 0-19-855370-6.

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English Journal

Selective photocatalytic oxidation of alcohols to aldehydes in water by TiO2 partially coated with WO3.

Tsukamoto D, Ikeda M, Shiraishi Y, Hara T, Ichikuni N, Tanaka S, Hirai T.SourceResearch Center for Solar Energy Chemistry and Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Japan.
Chemistry (Weinheim an der Bergstrasse, Germany).Chemistry.2011 Aug 22;17(35):9816-24. doi: 10.1002/chem.201100166. Epub 2011 Jul 6.
Semiconductor TiO(2) particles loaded with WO(3) (WO(3)/TiO(2)), synthesized by impregnation of tungstic acid followed by calcination, were used for photocatalytic oxidation of alcohols in water with molecular oxygen under irradiation at λ>350 nm. The WO(3)/TiO(2) catalysts promote selective o
PMID 21735494

Borotungstate polyoxometalates: multinuclear NMR structural characterization and conversions in solutions.

Maksimovskaya RI, Maksimov GM.SourceBoreskov Institute of Catalysis, Lavrentiev av. 5, Novosibirsk 630090, Russia. rimax@catalysis.ru
Inorganic chemistry.Inorg Chem.2011 Jun 6;50(11):4725-31. Epub 2011 Apr 28.
The unique heteropolyanion [H(3)BW(13)O(46)](8-) (BW(13)), previously suggested on the basis of indirect evidence, and protonated lacunary heteropolyanion [HBW(11)O(39)](8-) (BW(11)) have been identified in aqueous solutions at pH 5-7.5 from NMR spectra. The pattern of tungsten-tungsten connectiviti
PMID 21526755

Japanese Journal

Chemical processes employing inorganic layered compounds for inorganic and inorganic–organic hybrid materials

Journal of the Ceramic Society of Japan 122(1427), 523-529, 2014
… The focus is placed on three topics: preparation of new ion-exchangeable layered perovskites and a tungstic acid from Aurivillius phases via selective leaching of bismuth oxide sheets; …
NAID 130004950971

New processing method for tungsten carbide nano-crystalline particles and nano structural carbon via polyacrylonitrile gasification

, , ,
Journal of the Ceramic Society of Japan 122(1427), 570-573, 2014
… Starting materials for WC synthesis were selected tungstic acid (H2WO4) and polyacrylonitrile (PAN) powders. …
NAID 130004950963

Improvement of the Photochromic Properties of WO3-Based Composite Films by Phosphorus Addition

, , ,
Bulletin of the Chemical Society of Japan 87(7), 838-841, 2014
… Phosphorus tungstic heteropolyacid was synthesized by mixing P2O5 and peroxoisopolytungstic acid (W-IPA) in methanol solution. … WO3-based composite films fabricated from phosphorus tungstic heteropolyacid and transparent urethane resin showed reversible photochromic properties. …
NAID 130004059130

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リンク元	「tungstate」「タングステン酸」
拡張検索	「phosphotungstic acid method」「phosphotungstic acid」

「tungstate」

Tungstic acid
	IUPAC name dihydroxy-dioxotungsten
	Other names Orthotungstic acid
Identifiers
CAS number	7783-03-1
PubChem	1152
EC number	231-975-2
RTECS number	YO7840000
Jmol-3D images	Image 1
	SMILES O[W](=O)(=O)O ;
	InChI InChI=1S/2H2O.2O.W/h2*1H2;;;/q;;;;+2/p-2 ;
Properties
Molecular formula	H2WO4
Molar mass	249.853 g/mol
Appearance	yellow powder
Density	5.59 g/cm3
Melting point	100 °C (decomp)
Boiling point	1,473 °C (2,683 °F; 1,746 K)
Solubility in water	insoluble
Solubility	soluble in HF, ammonia
Hazards
NFPA 704	0 2 0
	Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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	Infobox references