Stability of potassium fluoride peroxosolvate in aqueous solution

The stability of KF . H2O2 in aqueous solution was studied. For observation times of 40 h, the average percentage dissociation of a 10% H2O2 solution of KF . H2O2 at 20 degreesC is 8 x 10(-5)%/h. The solutions are stable even at elevated temperatures. Thermal decomposition curves for temperatures from 75 to 95 degreesC plotted in the ln(c(0)/c)-tau space show two linear segments with elevated rates at the late stage. Transition to the elevated rates is observed in tau = 310 min at 75 degreesC and in 160-180 min at 80-90 degreesC. At 20 degreesC, it is observed in 385 h. The values of k x 10(4) in min(-1) (degreesC) are k(1) 1.7 (75), 4.8 (80), 6.1 (85), 7.7 (90), and 11.8 (95); the corresponding values of k(2) are 5.0 (75), 5.5 (80), 11.4 (85), 12.1 (90), and 14.1 (95). E-1 = 72.8 kJ/mol, and E-2 = 60.4 kJ/mol.