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无水钾镁矾类复盐K₂Mg₂（SO₄）₃的热化学研究

Thermochemical studies on the langbeinite-type double sulfate salt K₂Mg₂（SO₄）₃

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【Author】 ZHOU Ya-ping1, XU Fang1, ZHANG Rui2 , WAN Hong-wen2, ZHAN Zheng-kun2 (1.Department of Chemistry, Hanggang Normal University, Hangzhou, Hubei 438000; 2.Department of Chemistry, Central China Normal University, Wuhan 430079)

【机构】湖北黄冈师范学院化学系；华中师范大学化学系；华中师范大学化学系湖北黄州438000；湖北黄州438000；武汉430079；武汉430079；

【摘要】用具有恒定温度环境的新型反应热量计 ,以 3mol·dm-3 HNO3 溶液作为量热溶剂 ,在 2 98.2K条件下 ,设计了一个热化学循环 ,根据Hess定律分别测定了反应混合物 (K2 SO4 +2MgSO4 )和产物K2 Mg2 (SO4 ) 3 的摩尔溶解焓变 ,并结合其它标准数据 ,计算出了具有无水钾镁矾结构的硫酸复盐K2 Mg2 (SO4 ) 3 的标准摩尔生成焓变 ,其值为 - 3 95 3 .0 7± 0 .2 5kJ·mo1-1.更多还原

【Abstract】 The standard molar enthalpies of dissolution of mixtures(K 2SO 4∶2MgSO 4) and double salt K 2Mg 2(SO 4) 3 in aqueous 3 mol·dm -3 HNO 3 have been measured by using an isoperibol reaction calorimeter at 298.2 K.From the values obtained together with auxiliary data and by using appropiate thermochemical cycle,the standard molar formation enthalpy of langbeinite-type double salfate salt K 2Mg 2(SO 4) 3 was hence derived as -3 953.07±0.25 kJ·mo1 -1.更多还原