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本文使用恒定环境温度热量计测定了K_2B_4O_7·4H_2O在298.2K水中的溶解热,通过热化学循环求得K_2B_4O_7·4H_2O的标准生成焓,由溶解度的测定得到溶解熵和溶解自由焓△G,进而求得K_2B_4O_7·4H_2O的标准生成自由焓△G_f~0。
In this paper, the heat of decomposition of K_2B_4O_7 · 4H_2O in 298.2K water was determined by a constant ambient temperature calorimeter. The standard enthalpy of formation of K_2B_4O_7 · 4H_2O was obtained by thermochemical cycle. The entropy of solution and the enthalpy of solution △ G were determined by the determination of solubility. Get K 2 B 4 O 7 · 4H 2 O standard enthalpy of formation △ G_f ~ 0.