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|Section2= |Section3= |Section7= |Section8= }} Potassium chromate is the inorganic compound with the formula (K2CrO4. This yellow solid is the potassium salt of the chromate anion. It is a common laboratory chemical, whereas sodium chromate is important industrially. It is a class two carcinogen.〔(Potassium chromate information ) URL last accessed 15 March 2007〕 ==Structure== Two crystalline forms are known, both being very similar to the corresponding potassium sulfate. Orthorhombic β-K2CrO4 is the common form, but it converts to an α-form above 66 °C.〔Gerd Anger, Jost Halstenberg, Klaus Hochgeschwender, Christoph Scherhag, Ulrich Korallus, Herbert Knopf, Peter Schmidt, Manfred Ohlinger, "Chromium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005. 〕 These structures are complex, although the sulfate adopts the typical tetrahedral geometry.〔Gaultier, M.; Pannetier, G. "Structure cristalline de la forme 'basse temperature' du sulfate de potassium K2SO4-beta" (Crystal structure of the "low temperature" β-form of potassium sulfate) Bulletin de la Societe Chimique de France 1968, vol. 1, pp. 105-12.〕 File:Structure of K2SO4, K2CrO4 and some related compounds.tif|Structure of β-K2CrO4. File:TopView10cnK.tif|Coordination sphere of one of two types of K+ site. File:SO4sphere.tif|The environment about the tetrahedral CrO42- center in β-K2CrO4. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「potassium chromate」の詳細全文を読む スポンサード リンク
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