Yuan Aiqun, Wu Jian, Huang Zaiyin, Song Baoling, Liao Sen. Thermochemical Study on Solid State Reaction of Nanocrystalline Zinc Phosphate Tetrahydrate at Room Temperature[J]. Chinese Journal of Chemical Physics , 2005, 18(6): 1053-1056. doi: 10.1088/1674-0068/18/6/1053-1056
Citation: Yuan Aiqun, Wu Jian, Huang Zaiyin, Song Baoling, Liao Sen. Thermochemical Study on Solid State Reaction of Nanocrystalline Zinc Phosphate Tetrahydrate at Room Temperature[J]. Chinese Journal of Chemical Physics , 2005, 18(6): 1053-1056. doi: 10.1088/1674-0068/18/6/1053-1056

Thermochemical Study on Solid State Reaction of Nanocrystalline Zinc Phosphate Tetrahydrate at Room Temperature

doi: 10.1088/1674-0068/18/6/1053-1056
Funds:  Project supported by the Youth Science Foundation of Guangxi Province (03390112), Self-raised Foundation of Guangxi Province Education Department (2003).
  • Received Date: 2004-12-08
  • 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.
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Thermochemical Study on Solid State Reaction of Nanocrystalline Zinc Phosphate Tetrahydrate at Room Temperature

doi: 10.1088/1674-0068/18/6/1053-1056
Funds:  Project supported by the Youth Science Foundation of Guangxi Province (03390112), Self-raised Foundation of Guangxi Province Education Department (2003).

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.

Yuan Aiqun, Wu Jian, Huang Zaiyin, Song Baoling, Liao Sen. Thermochemical Study on Solid State Reaction of Nanocrystalline Zinc Phosphate Tetrahydrate at Room Temperature[J]. Chinese Journal of Chemical Physics , 2005, 18(6): 1053-1056. doi: 10.1088/1674-0068/18/6/1053-1056
Citation: Yuan Aiqun, Wu Jian, Huang Zaiyin, Song Baoling, Liao Sen. Thermochemical Study on Solid State Reaction of Nanocrystalline Zinc Phosphate Tetrahydrate at Room Temperature[J]. Chinese Journal of Chemical Physics , 2005, 18(6): 1053-1056. doi: 10.1088/1674-0068/18/6/1053-1056

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