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Provides some alternatives to the traditional definition of pH that introductory students may find more intuitive and less confusing.

A spot test has been developed for detecting micro quantities of all types of basic organic nitrogen compounds as well as their salts. This test, which is based upon the precipitation of amine cations by aqueous sodium tetraphenylborate solution at pH 3, is sensitive and selective, yet simple. The sensitivities of various amine cations to 1 drop of 6% tetraphenyl-1428 • ANALYTICAL CHEMISTRY

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