Potentiometric Titration in Nonaqueous Solutions

Potentiometric Titration in Nopaqeous Solutions

“…For practical purposes it is useful to employ sodium butoxide in butyl alcohol as the reagent (7), especially if it is in constant use for other purposes in the same laboratory. Also it is advantageous to add 10 cc.…”

“…The apparatus used consisted of a Leeds & Xorthrup Type K potentiometer and 2500-e galvanometer, a saturated calomel half-cell, a quinhydrone electrode, a titration cell, and a storage system for alkali (1,7). Titrations have also been carried out with the thermionic titrimeter (1).…”

“…A 0.05 N solution of potassium hydroxide in the purified ether, prepared and stored as with butyl alcohol solutions, was used as a standard reagent for the titrations in this solvent. The stability of such a solution is comparable to that of similar butyl alcohol solutions (7). The sodium butoxide in butyl alcohol used in part of the work was prepared and stored as previously described (7).…”

“…The stability of such a solution is comparable to that of similar butyl alcohol solutions (7). The sodium butoxide in butyl alcohol used in part of the work was prepared and stored as previously described (7).…”

Determination of Acidity in Insulating Oil

“…The resulting alcoholic potassium hydroxide was 0.01 M, as measured by titration of strong (hydrochloric, picric) or weak (benzoic, stearic) acids. In other words, the weak acid salt content (14) of the alkali was too small to be detected and remained so for several months (Figure 3). n-Butanol containing potassium hydroxide was found to be more susceptible to oxidation and light action, although it was satisfactory for use in oil acidity titrations.…”