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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2024年9月9日

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

摘要

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.