摘要
在大约1mol·dm-3的盐酸水溶液中测定了K2O·MgO·6B2O3·10H2O的溶解焓。结合已获得的其它热化学数据,得出K2O·MgO·6B2O3·10H2O的标准摩尔生成焓为-(12250.35±9.68)kJ·mol-1,并利用“基团贡献法”计算出标准摩尔吉布斯自由能为-11103kJ·mol-1。从而计算出其标准摩尔生成熵和标准摩尔熵。
The enthalpies of solution of K2O·MgO·6B2O3·10H2O in approximately 1mol·dm-3 aqueous hydrochloric acid,and of KCI in aqueous(hydrochloric acid +boric acid +magnesium oxide )were determined. Together with the previously determined enthal- pies of solution of H3BO3 in approximately 1 mol· dm-3HCI(aq), and of MgO in aqueous (hydrochloric acid+boric acid ),the standard molar enthalpy of formation of-(12250. 35± 9. 68)kJ· mol-1 for K2O· MgO· 6B2O3· 10H2O was obtained from the standard molar en- thalpies of formation of MgO(s), H2BO3(s), KCI(s), and H2O(1). The standard molar en- tropy of formation of-3848. 23J. K-1· mol-1 and standard molar entropy of 765. 96 J· K-1· mol-1 for K2O· MgO· 6B2O3· 10H2O were calculated from the thermodynamic relations.
出处
《盐湖研究》
CSCD
2001年第4期41-47,共7页
Journal of Salt Lake Research
关键词
K2O·MgO·6B2O3·10H2O
标准摩尔生成焓
溶液量热法
摩尔溶解焓
盐酸水溶液
Dipotassium magnesium dodecaborate decahydrate
Standard molar enthalpy of formation
Solution calorimetry
Molar enthalpy of solution
Aqueous hydrochloric acid solution