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Thermochemical Study on Solid State Reaction of Nanocrystalline Zinc Phosphate Tetrahydrate at Room Temperature
Yuan Aiqun*,Wu Jian,Huang Zaiyin,Song Baoling,Liao Sen
Author NameAffiliationE-mail
Yuan Aiqun* Department of Chemistry and Ecology Engineering, Guangxi University for Nationalities, Nanning 530006; School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004 yaqt@gxu.edu.cn  
Wu Jian Department of Chemistry and Ecology Engineering, Guangxi University for Nationalities, Nanning 530006  
Huang Zaiyin Department of Chemistry and Ecology Engineering, Guangxi University for Nationalities, Nanning 530006  
Song Baoling School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004  
Liao Sen School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004  
Abstract:
Nanocrystalline zinc phosphate tetrahydrate was synthesized by solid-state reaction at ambient temperature using Na3PO4·12H2O and ZnSO4·7H2O as regents. The enthalpy of reaction and the standard enthalpy of formation of zinc phosphate tetrahydrate were studied by microcalorimeter. According to Hess s law, a new thermochemical cycle was designed. The dissolution enthalpies of reactant (△H1) and product (△H2) were performed by a RD496 microcalorimeter at 298.15 K using aqueous solution of hydrochloric acid (4mol/L) as a calorimetric solvent. Ultraviolet spectrum, conductivity and refractive index were measured respectively. The results show as follows: △H1=(-47.180±0.084) kJ/mol, △H2=(-7.617±0.096 )kJ/mol. The ultraviolet spectra of the above solution are the same. Conductivity values after 500 times diluted are 2180 and 2181μs/cm respectively. Refractive indexes are 1.3679 and 1.3678 respectively. The standard enthalpy value of the reaction was calculated: △rHm=-39.530 kJ/mol. The standard enthalpy of formation for zinc phosphate tetrahydrate are recommended -4354.004 kJ/mol.
Key words:  Ambient temperature solid-solid reaction, Microcalorimeter, Standard enthalpy of formation, Nanocrystalline, Zinc phosphate
FundProject:
室温固相反应制备纳米四水磷酸锌的热化学研究
袁爱群*,吴健,黄在银,宋宝玲,廖森
摘要:
以Na3PO4?12H2O和ZnSO4?7H2O为原料,采用室温固相反应制备纳米四水磷酸锌,用微量热法研究该反应的反应焓和四水磷酸锌的标准摩尔生成焓.根据Hess定律,设计了一个新的热化学循环:以4mol/LHCl溶液为量热溶剂,用RD496微热量计于298.15K测定了反应物与产物在量热溶剂中的溶解焓分别为(-47.180±0.084)和(-7.617±0.096)kJ/mol,同时测定两种溶液的紫外光谱、折光率和电导率.两种溶液的紫外吸收曲线重叠,稀释500倍后的电导率值分别是2180、 2181μS
关键词:  室温固相反应  微热量计  标准摩尔生成焓  纳米  磷酸锌
DOI:10.1088/1674-0068/18/6/1053-1056
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