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|Section2= |Section3= |Section4= |Section7= |Section8= }} Calcium hydride is the chemical compound with the formula CaH2. This grey powder (white if pure, which is rare) reacts vigorously with water liberating hydrogen gas. CaH2 is thus used as a drying agent, i.e. a desiccant.〔Gawley, R. E., Davis, A., "Calcium Hydride," in Encyclopedia of Reagents for Organic Synthesis, 2001, John Wiley & Sons, Ltd. 〕 CaH2 is a saline hydride, meaning that its structure is salt-like. The alkali metals and the alkaline earth metals all form saline hydrides. A well-known example is sodium hydride, which crystallizes in the NaCl motif. These species are insoluble in all solvents with which they do not react. CaH2 crystallizes in the PbCl2 (cotunnite) structure.〔Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.〕 ==Preparation== Calcium hydride is prepared from its elements by direct combination of calcium and hydrogen at 300 to 400 °C.〔Peter Rittmeyer, Ulrich Wietelmann “Hydrides” in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. 〕 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「calcium hydride」の詳細全文を読む スポンサード リンク
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