Abstract
A comparison between aqueous and nonaqueous methods of analysis shows that nonaqueous titrations are applicable to the analysis of barbiturates and prove equivalent to the official method in accuracy and precision as well as being less tedious and time consuming. The authors recommend the use of lithium methoxide as a titrant. The end points are sharpened slihtly when a high ratio of benzene to solvent is employed. Thymol blue is fount to be a satisfactory indicator and titration to a deep blue color gives the true end point. The Schmall extractor lends itself readily to nonaqueous analysis.
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