摘要
用溶解量热法,以水为量热溶剂,根据 Hess 定律设计了一个热化学循环,用新型的具有恒定温度环境的反应热量计分别测定了以下两个过程的溶解热:2 K I O3+ Ni( I O3)2+ H2 O K+(aq)+ Ni2+(aq)+ I O3- (aq), K2 Ni( I O3)2·2 H2 O+ H2 O K+(aq)+ Ni2+(aq)+ I O3- (aq). 并根据 相关数据 求得 K2 Ni( I O3 )4 ·2 H2 O 在 298. 2 K 时 的标 准生 成焓, 其值 为- 2 127.20 k J·m ol- 1 ,同时根据该化合物的 D S C 数据估算了 K2 Ni( I O3)4 ·2 H2 O 的生成焓。
The molar dissolution enthalpies of the two processes: 2KIO 3+Ni(IO 3) 2 + H 2O K + (aq) + Ni 2+ (aq) + IO 3 - (aq) , K 2Ni(IO 3) 4·2H 2O + H 2O K + (aq) + Ni 2+ (aq) + IO 3 - (aq) . have been determined by solution calorimtry in a isoperibel reaction calorimeter.The calorimetric solvent is water. According to the Hess Law,we design a rational thermochemical cycle.From the results and other auxiliary quantities, the standard enthalpy of formation( △ fH θ m,298.2 K = -2 127.20 kJ·mol -1 )of a double salt K 2Ni(IO 3) 4·2H 2O is obtained. Simultaneously,the △ fH θ 298 K K 2Ni(IO 3) 4·2H 2O is calculated from the recorded △H 0 of the DSC curve.The values of △ fH θ 298 K K 2Ni(IO 3) 4·2H 2O determined by the two methods, are compared.
出处
《华中师范大学学报(自然科学版)》
CAS
CSCD
北大核心
1999年第3期387-390,共4页
Journal of Central China Normal University:Natural Sciences
基金
湖北省科委"九五"攻关项目
关键词
复盐
量热法
热化学
磺酸锂钾
磺酸复盐
double salt
K 2Ni(IO 3) 4·2H 2O
calorimetry
thermochemistry