Polarography and amperometric acidimetric titration of nonaqueous solutions of, aluminum isopropylate

Abstract

1. Aluminum isopropylate (AIP) in polarography in abs. isopropanol with a LiCl supporting electrolyte gives purely kinetic waves of the discharging of hydrogen. 2. The addition of strong acids to a solution of AIP leads first to a certain increase in its wave, approaching a limit, and when the equivalence point is reached, to the appearance and rapid growth of the wave of discharging of “free” hydrogen ions. 3. From 0.5 to 0.9 g-eq of acid is consumed per mole of AIP in titration with strong acids; this value depends on the ratio among the individual forms and products of partial hydrolysis of isopropylate, which can be used for the amperometric determination of its concentration. 4. The changes occurring in AIP can be followed according to the change ih the amount of acid used for the titration with time. 5. Solutions containing up to 10−2 mole of AIP are extremely stable at room temperature in the presence of water.