Abstract
Solubility products of MgO in molten (KCl+SrCl2) with composition corresponding to congruent compound K2SrCl4 at T=923, 973 and 1023K were determined by a potentiometric titration method using Pt(O2)|ZrO2(Y2O3) indicator electrode. The solubility product indices (pKs,MgO, mole fractions) were found to decrease with the temperature elevation by such a manner (9.92±0.13) at 923K, (9.34±0.11) at 973K and (9.08±0.13) at 1023K. The slope of logKs,MgO−T−1 plot in the studied temperature range (ca. 76kJ·mol−1) corresponds to value of fusion enthalpy of MgO (77kJ·mol−1). A comparison of MgO solubilities in the molten K2SrCl4 with the similar results obtained for (CsCl+KCl+NaCl) (0.455:0.245:0.300) and (KCl+LiCl) (0.41:0.59) eutectic melts shows that the values for K2SrCl4 melt are intermediate between those for low-acidic (CsCl+KCl+NaCl) and merely acidic (KCl+LiCl). The oxobasicity indices pIL of K2SrCl4 in the studied temperature range change from 2.26 to 2.45 with the temperature rise.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
