VOLUMETRIC PROPERTIES OF AQUEOUS-ELECTROLYTES AT HIGH-TEMPERATURE - MIXTURES OF LIOH AND KOH UP TO 523-K

The densities of mixtures of aqueous lithium and potassium hydroxides were measured up to 3 molal, at 373, 423 and 523 K at pressures close to saturation. The partial molar volumes were calculated and the coeff icients of the Pitzer equation for the mixtures were obtained. The mix ing volume is positive at 373 K while at higher temperatures the mixtu re is ideal within experimental error, probably as a result of associa tion of the lithium hydroxide.