Determination of Standard Molar Enthalpy of Formation for the Coordination Compound Zn(His)Cl2·1/2H2O(s) by an Isoperibol Solution−Reaction Calorimeter
Determination of Standard Molar Enthalpy of Formation for the Coordination Compound Zn(His)Cl2·1/2H2O(s) by an Isoperibol Solution−Reaction Calorimeter
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DOI：
10.1021/je034264n
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发表时间：
2004-05
影响因子：
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通讯作者：
Y. Di;Z. Tan;Sheng-li Gao;Shaoxu Wang
中科院分区：
文献类型：
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作者：
Y. Di;Z. Tan;Sheng-li Gao;Shaoxu Wang
建立了一种适用于测量固液和液液相互作用摩尔比的等周溶液反应量热计。用透明硬质玻璃制成的量热容器的体积约为100 cm ~ 3。当双蒸水体积为100cm ~ 3时，其能量当量为0.48kJ·K ~（-1）。热漏模量为2.7 × 10- 4s-1。量热计的时间常数约为2.9s。控温精度为± 0.001K，测温精度为± 0.0001K。通过测量KCl在双蒸水中的溶解焓（T =（298.15 ± 0.001）K时，Δs =（17547 ± 13 J·mol-1）），验证了量热计的性能，并将测量值与参考值进行了比较，其测量不确定度在±0.30%以内。测定了{ZnCl_2（s）+ l-His（s）}混合物和配合物Zn（His）Cl_2·1/2 H_2 O（s）在100cm ~ 3 2 mol·L ~（-1）HCl中的溶解摩尔比，Δd =（26.419 ± 0.001）K。
An isoperibol solution−reaction calorimeter suitable for measuring molar enthalpies of solid−liquid and liquid−liquid interactions was constructed. The volume of calorimetric vessel made by transparent hard glass is about 100 cm3. Its energy equivalent is 0.48 kJ·K-1 when containing 100 cm3 of double distilled water. The thermal leakage modulus is 2.7 × 10-4 s-1. The time constant of the calorimeter is about 2.9 s. The precision of controlling and measuring the temperature is within ±0.001 K and ±0.0001 K, respectively. The performance of the calorimeter was tested by measuring the enthalpy of dissolution of KCl in double distilled water, Δs = (17 547 ± 13 J·mol-1) at T = (298.15 ± 0.001) K, and the measuring uncertainty was estimated to be within ±0.30% by comparing our measured value with the reference. Molar enthalpies of dissolution of the {ZnCl2(s) + l-His(s)} mixture and the complex Zn(His)Cl2·1/2H2O(s) in 100 cm3 of 2 mol·L-1 HCl at T = (298.15 ± 0.001) K have been measured to be Δd = (26.419 ± 0.0...