Thermodynamic Properties of NaH2PO4⋅2H2O and K2HPO4⋅3H2O Crystal Hydrates

IF 0.7 4区化学 Q4 CHEMISTRY, PHYSICAL

Russian Journal of Physical Chemistry A Pub Date : 2024-09-09 DOI:10.1134/s0036024424701048

A. A. Novikov, Luo Yongxu, L. A. Tiflova, S. V. Kurdakova, N. A. Kovalenko, I. A. Uspenskaya

引用次数: 0

Abstract

NaH₂PO₄⋅2H₂O and K₂HPO₄⋅3H₂О crystal hydrates are synthesized from aqueous solutions at room temperature. The resulting samples are identified using X-ray structural analysis (XSA) and thermogravimetry (TG). The enthalpies of dissolution in water at 298.15 K are determined through the calorimetry of dissolution, and the standard enthalpies of formation for the crystal hydrates of sodium dihydrophosphate and potassium hydrophosphate are calculated. A comparison of the estimated and experimentally obtained values of the enthalpy of formation for NaH₂PO₄⋅2H₂O and K₂HPO₄⋅3H₂О shows they are within the limits of the error of determination.

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NaH2PO4⋅2H2O 和 K2HPO4⋅3H2O 晶体水合物的热力学性质

摘要在室温下从水溶液中合成了 NaH2PO4⋅2H2O 和 K2HPO4⋅3H2О 晶体水合物。利用 X 射线结构分析法（XSA）和热重法（TG）对所得样品进行了鉴定。通过溶解量热法确定了 298.15 K 时在水中的溶解焓，并计算了二氢磷酸钠和氢磷酸钾晶体水合物的标准形成焓。对 NaH2PO4⋅2H2O 和 K2HPO4⋅3H2О 的形成焓的估计值和实验值进行比较后发现，它们都在测定误差的范围之内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Russian Journal of Physical Chemistry A 化学-物理化学

CiteScore

1.20

自引率

14.30%

发文量

376

审稿时长

5.1 months

期刊介绍： Russian Journal of Physical Chemistry A. Focus on Chemistry (Zhurnal Fizicheskoi Khimii), founded in 1930, offers a comprehensive review of theoretical and experimental research from the Russian Academy of Sciences, leading research and academic centers from Russia and from all over the world. Articles are devoted to chemical thermodynamics and thermochemistry, biophysical chemistry, photochemistry and magnetochemistry, materials structure, quantum chemistry, physical chemistry of nanomaterials and solutions, surface phenomena and adsorption, and methods and techniques of physicochemical studies.

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