Abstract Magnesium hypophosphite Mg(H2PO2)2 is an important hypophosphite, and used as an drugs for the treatment of rheumatoid arthritis, plastic stabilizer, flameresistant material, fertilizer additive and the amendment of the soil, which can be synthesized via neutralization reaction and double decomposition reactions. In this work, the (solid + liquid) phase diagrams of (Mg(H2PO2)2 + H2O) binary systems, and (Mg(H2PO2)2 + NaH2PO2 + H2O), (Mg(H2PO2)2 + MgCl2 + H2O) ternary systems at 298.15 K were experimentally determined via the classical isothermal solubility equilibrium method. It was found that (1) two solid salts of Mg(H2PO2)2·6H2O and Mg(H2PO2)2 with transition temperature 325.15 K occur in the (Mg(H2PO2)2 + H2O) binary system, (2) three solid salts of Mg(H2PO2)2·6H2O, NaH2PO2·H2O and one incompatible double salt [NaMg(H2PO2)3] exist in (Mg(H2PO2)2 + NaH2PO2 + H2O) system, (3) Mg(H2PO2)2·6H2O, MgCl2·6H2O and one unknown double salt exist in (Mg(H2PO2)2 + MgCl2 + H2O) system, the unknown double was identified to be an incompatible double salt [Mg2(H2PO2)2Cl2·6H2O].

中文翻译：

---

(Mg(H 2 PO 2 ) 2 + H 2 O)、(Mg(H 2 PO 2 ) 2 + NaH 2 PO 2 + H 2 O) 和 (Mg(H 2 PO 2 ) 2 的固液相平衡+ MgCl 2 + H 2 O) 系统

摘要 次磷酸镁 Mg(H2PO2)2 是一种重要的次磷酸盐，用作治疗类风湿性关节炎的药物、塑料稳定剂、阻燃材料、肥料添加剂和土壤改良剂，可通过中和反应和复分解合成。反应。在这项工作中，（Mg（H2PO2）2 + H2O）二元体系的（固+液）相图，和（Mg（H2PO2）2 + NaH2PO2 + H2O），（Mg（H2PO2）2 + MgCl2 + H2O）三元298.15 K 的系统是通过经典的等温溶解度平衡方法通过实验确定的。发现(1) Mg(H2PO2)2·6H2O 和Mg(H2PO2)2 的两种固体盐，转变温度为325.15 K，存在于(Mg(H2PO2)2 + H2O)二元体系中，(2) 三种固体盐Mg(H2PO2)2·6H2O,