A Further Study of the Effect of Sugar Alcohols and their Anhydrides on the Dissociation of Boric Acid.

Abstract

Studies on the influence of mannitol and dulcitol and certain of their anhydrides on the dissociation of boric acid were reported in a previous communication (7). In general, the increased dissociation of boric acid produced by sugar alcohols was exhibited to a lesser degree or not at all by their anhydrides. Another series of these substances has been made available for study, and further investigations as to the effect of these compounds on the dissociation of boric acid have been instituted. MATERIALSThe-inositol, erythritol, pentaerythritol, and adonitol employed were Pfanstiehl's c.p. products and met the specifications of their catalogue.Ethylene glycol, ethylene oxide, propylene glycol, propylene oxide, and trimethylene glycol were supplied by the Eastman Kodak Co. The dihydroxyacetone employed was Oxantin, prepared formerly by Merck and Co. The epihydrin alcohol was prepared from epibromhydrin (1). The Z-epihydrin alcohol, distilling at 70°C. at 10 mm. pressure, was employed. The polygalitol was extracted from poly gala amara (9). The compound melted at 138°C. (uncorrected). The erythritan was prepared from erythritol by dehydration with sulfuric acid (2,6). Analysis gave the

Determination of Boron in Magnesite and Fused Magnesia

“…The blank is not an inherent fault of the determination due to impurities, etc., in the reagents used. It merely represents the number of milliliters of sodium hydroxide necessary to change the solution being titrated from a pH of 7.0 (the starting point) to a pH of approximately 11.0, which is the neutralization point in the boric acid titration (3,4). The blanks are very constant and absolutely reliable.…”

SUGAR ALCOHOLS. X: The Effect of Certain Sugar Alcohols and Their Anhydrides on the Dissociation of Boric Acid

“…In previous communications the authors (7,8) have studied the influence of various sugar alcohols and their anhydrides on the dissociation of boric acid. Later the physicochemical properties of the erythritan-boric acid complex were studied (9).…”

Study of the Boric Acid-Glycerin Complex II

“…This complex has been detected by many methods, among them being changes in pH (1,2 ) and in solubility (3). In most cases the addition of glycerin to boric acid will allow the formation of a complex compound which is soluble to a greater extent than boric acid alone.…”