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钨酸

此條目缺少或没有列出参考或来源,或者有未能查证的内容。 (2013年2月1日)維基百科所有的內容都應該可供查證,化学类条目亦需严谨。请协助添加来自可靠来源的引用以改善这篇化学类条目无法查证的内容可能被提出异议而移除。
钨酸(一水)
别名 钨酸
正钨酸
一水合氧化钨
识别
CAS号 7783-03-1 ?
性质
化学式 H2WO4
摩尔质量 249.85 g·mol⁻¹
外观 黄色粉末[1][2]
密度 5.5 g/cm3[2]
熔点 100 °C(分解[2]
溶解性 不溶
溶解性(其他) 不溶于酸[1],溶于碱液[1]氢氟酸氨水
pKa1 3.5[3]
pKa2 4.6[3]
危险性
NFPA 704
0
2
0
 
相关物质
其他阳离子 铬酸
钼酸
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

钨酸,是三氧化钨(WO3)各種水合物形態的總稱。三氧化钨一水合物,化學式為WO3·H2O 和半水合物(WO3·0.5H2O)[4]都是已知的。而类似硫酸结构的 (HO)2WO2 的钨酸分子未被发现。

性质

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黄色粉末。加热至100°C时失去一分子水而转变为三氧化钨。几乎不溶于酸,微溶于热水,溶于碱、氢氟酸氨水。钨酸比三氧化钨更容易溶于碱。[1]

历史

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最早由卡尔·威廉·舍勒于1781年分离出来。[5]

制备

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1、由钨酸钙盐酸作用,并经洗涤、干燥、粉碎,得到钨酸成品。[6]

2、由精钨酸铵溶液用盐酸酸解,得到钨酸,再经脱水、干燥、粉碎,得到钨酸成品。

3.纯钨和过氧化氢反应。[7]


用途

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用作制取金属钨合金钨酸盐类和硬质合金的原料。也用作石油催化剂、印染助剂和润滑剂。

参考资料

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  1. ^ 1.0 1.1 1.2 1.3 Entry on Wolframsäure. at: Römpp Online. Georg Thieme Verlag, retrieved 7. Januar 2018.
  2. ^ 2.0 2.1 2.2 Record of Wolframsäure in the GESTIS Substance Database from the IFA英语Institute for Occupational Safety and Health
  3. ^ 3.0 3.1 Holleman, Arnold Frederik; Wiberg, Egon, Wiberg, Nils , 编, Inorganic Chemistry, 由Eagleson, Mary; Brewer, William翻译, San Diego/Berlin: Academic Press/De Gruyter, 2001, ISBN 0-12-352651-5 
  4. ^ Günter, John R.; Amberg, Marcel; Schmalle, Helmut. Direct synthesis and single crystal structure determination of cubic pyrochlore-type tungsten trioxide hemihydrate, WO3 · 0.5H2O. Materials Research Bulletin. 1989, 24 (3): 289–292. doi:10.1016/0025-5408(89)90214-6. 
  5. ^ Scheele, Carl Wilhelm (1781) "Tungstens bestånds-delar"页面存档备份,存于互联网档案馆) (Tungsten's [i.e., Scheelite's] constituents), Kungliga Vetenskaps Academiens Nya Handlingar (Royal Scientific Academy's New Proceedings), 2: 89–95. (in Swedish)
  6. ^ Georg Brauer (Hrsg.) u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0, S. 1566.
  7. ^ Murau, P. C. Dissolution of Tungsten by Hydrogen Peroxide. Analytical Chemistry. 1961: 1125–1126. doi:10.1021/ac60176a021. 
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钨酸
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