Solubility Investigations in the Systems Li₂SO₄ + Li₂B₄O₇ + H₂O and K₂SO₄ + K₂B₄O₇ + H₂O at 288 K

Abstract

The solubility, density, electrical conductivity, and pH of the ternary systems Li2SO4 + Li2B4O7 + H2O and K2SO4 + K2B4O7 + H2O at 288 K were determined experimentally by the isothermal solution saturation method. On the basis of the experimental results, the phase diagrams and property-composition diagrams were plotted. Phase equilibrium solids were Li2SO4·H2O and Li2B4O7·3H2O in the ternary Li2SO4 + Li2B4O7 + H2O system and K2SO4 and K2B4O7·4H2O in the ternary K2SO4 + K2B4O7 + H2O system at 288 K. The two ternary systems all belong to a simple cosaturated type, and the phase diagrams have one invariant point and two univariant curves. Double salts or solid solutions have not been found. The results for the ternary systems are discussed simply.